RError.com

RError.com Logo RError.com Logo

RError.com Navigation

  • 主页

Mobile menu

Close
  • 主页
  • 系统&网络
    • 热门问题
    • 最新问题
    • 标签
  • Ubuntu
    • 热门问题
    • 最新问题
    • 标签
  • 帮助
主页 / user-274517

Kotysh's questions

Martin Hope
Kotysh
Asked: 2020-11-21 22:19:37 +0000 UTC

每 3 天的 Cron 表达式

  • 1

我想做一个每三天运行一次的 cron 表达式,如果你这样做0 8 */3 * *,这意味着每个月的第三天 8:00 都会触发一个计时器,我希望如果我设置一个表达式,那么它将每 3 天准确运行一次,例如,从 1 月 23 日开始,因此,接下来的几天:26 日 29 日和 2 月 1 日。这可以做到吗?怎么做?有一个想法是在几分钟内完成,即*/4800 * * * *理论上意味着每 3 天 8:00 触发一次

linux
  • 1 个回答
  • 10 Views
Martin Hope
Kotysh
Asked: 2020-10-10 18:50:08 +0000 UTC

如何使用 AdminService 获取有关 WebSphere 上的应用程序的信息?

  • 0

我有管理服务

private com.ibm.websphere.management.AdminService adminService = AdminServiceFactory.getAdminService();

有了它,我可以获得有关服务器的不同信息,但是我无法获得有关已安装应用程序的信息(名称,状态是否正在运行等),我认为我需要使用invoke方法,但基于文档,目前还不是很清楚如何做到这一点:

https://www.ibm.com/support/knowledgecenter/SS7JFU_8.5.5/com.ibm.websphere.javadoc.doc/web/apidocs/com/ibm/websphere/management/AdminService.html

我在网上没有找到类似的例子,请告诉我这是怎么回事

java
  • 1 个回答
  • 10 Views
Martin Hope
Kotysh
Asked: 2020-07-31 16:33:56 +0000 UTC

logstash 不会启动

  • 0

我根据 Windows 网站https://www.elastic.co/guide/en/beats/libbeat/5.6/logstash-installation.html的说明安装了logstash

当我运行它时,它说没有主类。 在此处输入图像描述

在谷歌里,到处都有大致相同的指令,不清楚是什么问题,可能是我没有下载东西或者需要在elasticsearch之上安装logstash

java
  • 1 个回答
  • 10 Views
Martin Hope
Kotysh
Asked: 2020-06-07 22:47:02 +0000 UTC

如何在 Oracle 中进行正确的行选择,类似于 PostgreSQL 中的限制和偏移

  • 1

有这样的要求

select * from
 (select * from
  (select a.*, rownum rnum from
   (select * from dimax)a)
 where rownum <= 5)
where rnum > 2

就地dimax的表总是不同的,也就是说,我有一百个表,它们的列不同,不知道我将在查询中使用哪个表。一切都会正常工作,但其中一个表可能与 rownum 别名匹配,然后查询将失败。如何解决这个问题并在未知表中选择所需的行?

sql
  • 1 个回答
  • 10 Views
Martin Hope
Kotysh
Asked: 2020-04-12 15:30:48 +0000 UTC

通过 JavaMail API 读取信件

  • 1

大家好!)我想知道是否可以使用 JavaMail API 以某种方式选择邮件中的消息,例如,使用某些用户,例如使用 example@example.ex,并获取服务器上的所有通信? 也就是说,我希望收到我发送给他的所有消息以及他发送给我的所有消息。除了通过此 API 发送消息外,我没有找到任何具体示例。是否有这种可能性,如果有,我应该使用什么或有某种教程?

java
  • 1 个回答
  • 10 Views
Martin Hope
Kotysh
Asked: 2020-01-31 15:05:48 +0000 UTC

是否可以在 Java 中增加池整数

  • 0

众所周知,如果在-128到127的范围内通过==比较2个Integer类型的对象,那么它们会比较这些对象中的值,如果数字不在这个范围内,那么引用到将比较对象。问题是是否可以增加这个池的大小,如果可以,怎么做?通过 == 来比较和更大的数字,比如变成这样:

Integer a = 800;
Integer b = 800;
System.out.println(a == b); //true
java
  • 1 个回答
  • 10 Views
Martin Hope
Kotysh
Asked: 2020-11-29 21:32:11 +0000 UTC

将 # 传递给 ResponseEntity 中请求参数中的 URL

  • -1

我有这个网址:

bookManag/book?name=world and war #2&field=1

我传入名称参数 - world and war #2 问题是在 # 之后所有内容都被切断并且下一个字段参数没有出现。好的,我找到了摆脱这种情况的方法并将哈希替换为 %23

bookManag/book?name=world and war %232&field=1

但主要问题不是这个,我试图通过 ResponseEntity 得到响应

    String url = "http://localhost:8081/bookManag/book?name=world and war %232&field=1";
    org.springframework.http.ResponseEntity result = restTemplate.exchange(url, HttpMethod.GET, entity, getRespType(), params);

之后,spring 内部已经发生错误,而不是我正确的 url,spring 将其重新制作为

"http://localhost:8081/bookManag/book?name=world and war %20%25232&field=1"

用 %2523 替换 %23 最终会给出错误的结果。如何解决这个问题?

java
  • 1 个回答
  • 10 Views
Martin Hope
Kotysh
Asked: 2020-10-26 06:35:49 +0000 UTC

使用 maven 构建时运行 JUnit 测试时抛出异常

  • 0

使用 JUnit 我测试数据库查询,如果我单独运行测试,那么一切正常,但如果我开始使用 maven 构建项目,那么由于此错误,没有任何测试通过:

Oct 26, 2018 1:33:09 AM org.apache.tomcat.jdbc.pool.ConnectionPool init
SEVERE: Unable to create initial connections of pool.
java.sql.SQLException: Unable to load class: oracle.jdbc.driver.OracleDriver from ClassLoader:sun.misc.Launcher$AppClassLoader@6bc7c054;ClassLoader:sun.misc.Launcher$AppClassLoader@6bc7c054
    at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:283)
    at org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:203)
    at org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection(ConnectionPool.java:738)
    at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:670)
    at org.apache.tomcat.jdbc.pool.ConnectionPool.init(ConnectionPool.java:482)
    at org.apache.tomcat.jdbc.pool.ConnectionPool.<init>(ConnectionPool.java:154)
    at org.apache.tomcat.jdbc.pool.DataSourceProxy.pCreatePool(DataSourceProxy.java:118)
    at org.apache.tomcat.jdbc.pool.DataSourceProxy.createPool(DataSourceProxy.java:107)
    at org.apache.tomcat.jdbc.pool.DataSourceProxy.getConnection(DataSourceProxy.java:131)
    at ru.dmitriikotiashov.dao.jdbc.ConnectionPool.getConnection(ConnectionPool.java:21)
    at ru.dmitriikotiashov.test.dao.ConnectionTest.getConnection(ConnectionTest.java:23)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:365)
    at org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:273)
    at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:238)
    at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:159)
    at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:379)
    at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:340)
    at org.apache.maven.surefire.booter.ForkedBooter.execute(ForkedBooter.java:125)
    at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:413)
Caused by: java.lang.ClassNotFoundException: Unable to load class: oracle.jdbc.driver.OracleDriver from ClassLoader:sun.misc.Launcher$AppClassLoader@6bc7c054;ClassLoader:sun.misc.Launcher$AppClassLoader@6bc7c054
    at org.apache.tomcat.jdbc.pool.ClassLoaderUtil.loadClass(ClassLoaderUtil.java:56)
    at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:272)
    ... 35 more
Caused by: java.lang.ClassNotFoundException: oracle.jdbc.driver.OracleDriver
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:348)
    at org.apache.tomcat.jdbc.pool.ClassLoaderUtil.loadClass(ClassLoaderUtil.java:38)
    ... 36 more

我无法弄清楚问题是什么,请告诉我如何解决?

java
  • 1 个回答
  • 10 Views
Martin Hope
Kotysh
Asked: 2020-10-19 23:20:45 +0000 UTC

为什么@Qualifier 在@Service 中不起作用?

  • 3

有一个接口

package ioc.primary_annotation;

public interface Animal {

    void display();

}

两个类实现它

package ioc.primary_annotation;

import org.springframework.stereotype.Component;

@Component("kitty")
public class Cat implements Animal {
    public void display() {
        System.out.println("Cat.display");
    }
}

和

package ioc.primary_annotation;

import org.springframework.stereotype.Component;

@Component("doggi")
public class Dog implements Animal {
    public void display() {
        System.out.println("Dog.display");
    }
}

有一个配置类

package ioc.primary_annotation;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

@Configuration
@ComponentScan(basePackages = "ioc.primary_annotation")
public class AppConfig {
}

和服务

package ioc.primary_annotation;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;;
import org.springframework.stereotype.Service;

@Service
public class AnimalService {

    @Autowired
    @Qualifier("kitty")
    private Animal animal;

    public AnimalService() {
    }

    public Animal getAnimal() {
        return animal;
    }

    public void setAnimal(Animal animal) {
        this.animal = animal;
    }
}

所有这些都应该在 main 方法中起作用

package ioc.primary_annotation;

import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class PrimaryMain {

    public static void main(String[] args) {

        ApplicationContext applicationContext = new AnnotationConfigApplicationContext(AppConfig.class);
        Animal animal = applicationContext.getBean(Animal.class);
        animal.display();

    }

}

但它不起作用,抛出异常。

Exception in thread "main" org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'ioc.primary_annotation.Animal' available: expected single matching bean but found 2: kitty,doggi

问题是为什么它不起作用,因为我通过限定符指出了我应该使用哪个 bean?如果我在 Cat 或 Dog 类上方指定 @Primary 注释,那么一切都会神奇地开始工作,请告诉我这里有什么神奇之处,在此先感谢 :)

java
  • 2 个回答
  • 10 Views
Martin Hope
Kotysh
Asked: 2020-06-18 20:04:26 +0000 UTC

在 REST 请求中反序列化 Json

  • 0

大家好!我有这样的问题

@RequestMapping(value = "/createrobot", method = RequestMethod.POST)
public Robot createRobot(
        @RequestParam(value="id", required = false, defaultValue = "-") String id,
        @RequestParam(value="name", required = false, defaultValue = "-") String name,
        @RequestParam(value="age", required = false, defaultValue = "-") String age,
        @RequestBody Robot robot){

    return new Robot(1, "Maks", "456");

}

我在 POSTMAN http://localhost:8081/supercontroller/createrobot中发出请求

我通过 Json

{
    "id": 78,
    "name": "-",
    "age": "-"
}

发生错误:

{
    "timestamp": "2018-06-18T11:57:02.825+0000",
    "status": 500,
    "error": "Internal Server Error",
    "message": "Type definition error: [simple type, class ru.asdf.Robot]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `ru.asdf.Robot` (no Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator)\n at [Source: (PushbackInputStream); line: 2, column: 5]",
    "path": "/supercontroller/createrobot"
}

我看到问题出在反序列化中,我该如何解决?有一个机器人实体

public class Robot {

    Integer id;
    String name;
    String age;

    public Robot(int id, String name, String age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }
}

使用什么注释?

java
  • 1 个回答
  • 10 Views
Martin Hope
Kotysh
Asked: 2020-05-18 14:58:31 +0000 UTC

在 tortoiseSVN 中创建补丁的问题

  • 0

我正在尝试在 TortoiseSVN 中创建补丁,但是我无法提交已删除的文件,即当我运行 create patch 命令时,补丁中只显示已删除的文件,并且只有已添加或更改的文件结束在补丁中。帮助解决问题。我通过右键单击项目文件夹并选择创建补丁命令来制作补丁。提前致谢!

svn
  • 1 个回答
  • 10 Views
Martin Hope
Kotysh
Asked: 2020-04-23 00:41:18 +0000 UTC

Racket 或 Scheme 找到简单函数的导数

  • 0

大家好!我需要用 Racket 语言实现一个函数,该函数用一个变量计算简单数学表达式的导数。该函数必须有 2 个参数 - 具有 Scheme 语言标准语法的数学表达式,包含数字、原子(常量和变量)和函数 +、-、*、/、expt(数字 e 的取幂)。第二个参数是需要区分的变量。表达式中的其他字符被视为常量。
也许有人遇到过类似的问题并且知道如何解决或从哪里开始?或者也许有一些文章专门讨论函数式语言的差异化。我在谷歌上搜索过,找不到类似的东西。对函数式语言中的算法感兴趣,可以是 Lisp、Scheme

lisp
  • 1 个回答
  • 10 Views
Martin Hope
Kotysh
Asked: 2020-03-19 14:48:47 +0000 UTC

增量在 Java 中的工作原理

  • 0

有一个关于Java增量工作的问题,我无法理解他在这些表达式中如何考虑它的逻辑:

    int a = 5;
    int b = 5;
    int c = 5;
    int d = 5;
    int e = 5;
    int f = 5;

    a += a++; //10
    b += b++ + ++b + b++; //24
    c = c++ + c++; //11
    d = d++ + ++d + d++ + ++d; //28
    e += e++ + ++e + e++ + ++e; //33
    f = f++; //5

最重要的是带有变量aand的表达式f,我想了解它在 JVM 中是如何工作的

java
  • 2 个回答
  • 10 Views
Martin Hope
Kotysh
Asked: 2020-01-25 05:31:42 +0000 UTC

在 java ee 中连接 log4j

  • 0

想把log4j连接到java ee,但是怎么都实现不了,不明白是什么问题,或者一开始就没有正确设置日志

通过 maven 我在 pom.xml 中连接库我添加 log4j

    <dependencies>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
    </dependencies>

log4j.xml 在资源中

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j='http://jakarta.apache.org/log4j/'
                     debug="true">

    <appender name="fileAppender" class="org.apache.log4j.RollingFileAppender">
        <param name="maxFileSize" value="5KB"/>
        <param name="maxBackupIndex" value="4"/>
        <param name="file" value="loggi/logfileDAO.log"/>
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern"
                   value="%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1} - %m%n"/>
        </layout>
    </appender>

    <category name="ru.dmitriykotyshov.DAO">
        <!--all, trace, debug, info, warn, error, fatal-->
        <priority value="info"/>
        <appender-ref ref="fileAppender"/>
    </category>

</log4j:configuration>

我开始写日志并出现错误

log4j:ERROR Could not parse url [file:/C:/Users/Дмитрий/IdeaProjects/projectTrainTicket/out/artifacts/projectTrainTicket/WEB-INF/classes/log4j.xml].
com.sun.org.apache.xerces.internal.util.URI$MalformedURIException: Path contains invalid character: Д
    at com.sun.org.apache.xerces.internal.util.URI.initializePath(URI.java:1109)
    at com.sun.org.apache.xerces.internal.util.URI.initialize(URI.java:582)
    at com.sun.org.apache.xerces.internal.util.URI.<init>(URI.java:335)
    at com.sun.org.apache.xerces.internal.util.URI.<init>(URI.java:298)
    at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.expandSystemIdStrictOff1(XMLEntityManager.java:2221)
    at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.expandSystemId(XMLEntityManager.java:2053)
    at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.resolveEntityAsPerStax(XMLEntityManager.java:968)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.dispatch(XMLDocumentScannerImpl.java:1152)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.next(XMLDocumentScannerImpl.java:1045)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:959)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:602)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:505)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:841)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:770)
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
    at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:243)
    at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:339)
    at org.apache.log4j.xml.DOMConfigurator$2.parse(DOMConfigurator.java:769)
    at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:871)
    at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:778)
    at org.apache.log4j.helpers.OptionConverter.selectAndConfigure(OptionConverter.java:526)
    at org.apache.log4j.LogManager.<clinit>(LogManager.java:127)
    at org.apache.log4j.Logger.getLogger(Logger.java:117)
    at ru.dmitriykotyshov.GetRoute.<clinit>(GetRoute.java:26)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at java.lang.Class.newInstance(Class.java:442)
    at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:114)
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1133)
    at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:853)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:135)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:962)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1115)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)
    at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2555)
    at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2544)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)
log4j:WARN No appenders could be found for logger (ru.dmitriykotyshov.GetRoute).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

如何解决此问题或如何在 java ee 中连接日志?

java-ee
  • 1 个回答
  • 10 Views
Martin Hope
Kotysh
Asked: 2020-01-06 17:42:26 +0000 UTC

到 Oracle 的 JDBC 连接

  • 1

无法连接到oracle数据库

Class.forName("oracle.jdbc.driver.OracleDriver");
Connection connection = null;
connection = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe","dima","123456");
connection.close();

抛出异常,不知道如何正确指定url地址

Exception in thread "main" java.sql.SQLException: ORA-00604: error occurred at recursive SQL level 1
ORA-12705: Cannot access NLS data files or invalid environment specified

    at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:447)
    at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:389)
    at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:382)
    at oracle.jdbc.driver.T4CTTIfun.processError(T4CTTIfun.java:675)
    at oracle.jdbc.driver.T4CTTIoauthenticate.processError(T4CTTIoauthenticate.java:448)
    at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:513)
    at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:227)
    at oracle.jdbc.driver.T4CTTIoauthenticate.doOAUTH(T4CTTIoauthenticate.java:383)
    at oracle.jdbc.driver.T4CTTIoauthenticate.doOAUTH(T4CTTIoauthenticate.java:776)
    at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:432)
    at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:553)
    at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:254)
    at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:32)
    at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:528)
    at java.sql.DriverManager.getConnection(DriverManager.java:664)
    at java.sql.DriverManager.getConnection(DriverManager.java:247)
    at ru.mypackage.databaseConnection.Main.main(Main.java:20)

Process finished with exit code 1

Oracle 安装在本地服务器上

连接名称 - MyServerConnection 连接详情 - dima@//localhost:1521/xe

java
  • 1 个回答
  • 10 Views
Martin Hope
Kotysh
Asked: 2020-12-12 05:28:10 +0000 UTC

从双端队列中间删除元素的最正确方法是什么?

  • 0

大家好!需要从双端队列中删除元素。我使用另一个双端队列将所有元素推送到那里,除了被删除的元素,从而达到预期的结果,代码如下:

int main(){

        deque<int> list1;

        for (int i=0; i<10; i++){

            list1.push_back(i);

        }

        deque<int> list2;

        int deleteElement = 5;

        for (int i=0; i<list.size(); i++){

            if (list1[i] != deleteElement){
                list2.push_back(list1[i]);
            }

        }

}

但这需要很长时间,因为我将除被删除的元素之外的所有元素复制到另一个双端队列。我的问题是,有没有更优雅的方法从双端队列中间删除一个元素?

c++
  • 1 个回答
  • 10 Views
Martin Hope
Kotysh
Asked: 2020-11-30 01:02:37 +0000 UTC

java ee项目中的根目录

  • 0

我正在使用tomcat,我无法以任何方式找到根目录来设置文件的路径。我必须写绝对,告诉我它在哪里。

java-ee
  • 1 个回答
  • 10 Views
Martin Hope
Kotysh
Asked: 2020-11-29 21:46:03 +0000 UTC

TomCat发送消息到邮件,编码问题

  • 0

大家好!我在tomcat上使用mailapi 1.4.7向邮件发送消息,如果您使用俄语字母,错误会出现在邮件中。如何确保 krakozyabry 不来?如何更改编码?

java-ee
  • 1 个回答
  • 10 Views
Martin Hope
Kotysh
Asked: 2020-11-22 23:38:21 +0000 UTC

通过 Java EE servlet 通过邮件发送消息

  • 0

有一个用于向邮件发送消息的代码,如果您通过 main 方法而不是在服务器上运行它,那么一切正常并且消息会发送到邮件

  import java.util.Properties;
    import javax.mail.Message;
    import javax.mail.MessagingException;
    import javax.mail.PasswordAuthentication;
    import javax.mail.internet.*;
    import javax.mail.*;

    public class MainClass {

        public static void main(String[] args) {

            Properties p = new Properties();
            p.put("mail.smtp.host", "smtp.yandex.ru");
            p.put("mail.smtp.socketFactory.port", 465);
            p.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
            p.put("mail.smtp.auth", "true");
            p.put("mail.smtp.port", 465);




            Session s = Session.getInstance(p,

                    new javax.mail.Authenticator(){


                        protected PasswordAuthentication getPasswordAuthentication(){

                            return new PasswordAuthentication("mailOtpravitely@mail.ru", "passwordOtpravitely");

                        }


                    }
            );


            Message message = new MimeMessage(s);
            try {
                message.setFrom(new InternetAddress("mailOtpravitely@mail.ru"));
                message.setRecipient(Message.RecipientType.TO, new InternetAddress("mailPolychately@yandex.ru"));
                message.setSubject("Тема письма");
                message.setText("Сообщение в письме");

                Transport.send(message);

                System.out.println("Письмо успешно отправлено");

            } catch (MessagingException e) {
                System.out.println("Письмо не отправилось");
                e.printStackTrace();
            }

        }

    }

但是,如果我使用此代码在 TomCat 中创建一个 servlet,则会发生错误并且服务器无法启动:

SEVERE: ContainerBase.addChild: start: 
org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:1015)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:991)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
    at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1899)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
    at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:618)
    at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:565)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
    at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468)
    at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)
    at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)
    at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1401)
    at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:324)
    at sun.rmi.transport.Transport$1.run(Transport.java:200)
    at sun.rmi.transport.Transport$1.run(Transport.java:197)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NoClassDefFoundError: javax/mail/MessagingException
    at java.lang.Class.getDeclaredFields0(Native Method)
    at java.lang.Class.privateGetDeclaredFields(Class.java:2583)
    at java.lang.Class.getDeclaredFields(Class.java:1916)
    at org.apache.catalina.util.Introspection.getDeclaredFields(Introspection.java:106)
    at org.apache.catalina.startup.WebAnnotationSet.loadFieldsAnnotation(WebAnnotationSet.java:270)
    at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:139)
    at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:65)
    at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:417)
    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:891)
    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:388)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5519)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
    ... 42 more
Caused by: java.lang.ClassNotFoundException: javax.mail.MessagingException
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1892)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1735)
    ... 56 more

ноя 22, 2017 6:22:47 PM org.apache.tomcat.util.modeler.BaseModelMBean invoke
SEVERE: Exception invoking method manageApp
java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]]
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:1019)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:991)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
    at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1899)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
    at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:618)
    at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:565)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
    at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468)
    at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)
    at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)
    at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1401)
    at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:324)
    at sun.rmi.transport.Transport$1.run(Transport.java:200)
    at sun.rmi.transport.Transport$1.run(Transport.java:197)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

ноя 22, 2017 6:22:47 PM org.apache.tomcat.util.modeler.BaseModelMBean invoke
SEVERE: Exception invoking method createStandardContext
javax.management.RuntimeOperationsException: Exception invoking method manageApp
    at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:309)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
    at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:618)
    at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:565)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
    at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468)
    at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)
    at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)
    at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1401)
    at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:324)
    at sun.rmi.transport.Transport$1.run(Transport.java:200)
    at sun.rmi.transport.Transport$1.run(Transport.java:197)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]]
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:1019)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:991)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
    at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1899)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301)
    ... 33 more

看不懂怎么回事,牺牲了映射之类的东西,万事大吉,我把代码放在doPost方法里自然没有main方法

java
  • 1 个回答
  • 10 Views
Martin Hope
Kotysh
Asked: 2020-11-20 04:46:22 +0000 UTC

Java EE Servlet 获取从哪个浏览器发出请求的信息

  • 0

请求是如何通过HttpServletRequest或HttpServletResponse从哪个浏览器发出的?还是有其他方法可以获取此信息?

java-ee
  • 1 个回答
  • 10 Views

Sidebar

Stats

  • 问题 10021
  • Answers 30001
  • 最佳答案 8000
  • 用户 6900
  • 常问
  • 回答
  • Marko Smith

    我看不懂措辞

    • 1 个回答
  • Marko Smith

    请求的模块“del”不提供名为“default”的导出

    • 3 个回答
  • Marko Smith

    "!+tab" 在 HTML 的 vs 代码中不起作用

    • 5 个回答
  • Marko Smith

    我正在尝试解决“猜词”的问题。Python

    • 2 个回答
  • Marko Smith

    可以使用哪些命令将当前指针移动到指定的提交而不更改工作目录中的文件?

    • 1 个回答
  • Marko Smith

    Python解析野莓

    • 1 个回答
  • Marko Smith

    问题:“警告:检查最新版本的 pip 时出错。”

    • 2 个回答
  • Marko Smith

    帮助编写一个用值填充变量的循环。解决这个问题

    • 2 个回答
  • Marko Smith

    尽管依赖数组为空,但在渲染上调用了 2 次 useEffect

    • 2 个回答
  • Marko Smith

    数据不通过 Telegram.WebApp.sendData 发送

    • 1 个回答
  • Martin Hope
    Alexandr_TT 2020年新年大赛! 2020-12-20 18:20:21 +0000 UTC
  • Martin Hope
    Alexandr_TT 圣诞树动画 2020-12-23 00:38:08 +0000 UTC
  • Martin Hope
    Air 究竟是什么标识了网站访问者? 2020-11-03 15:49:20 +0000 UTC
  • Martin Hope
    Qwertiy 号码显示 9223372036854775807 2020-07-11 18:16:49 +0000 UTC
  • Martin Hope
    user216109 如何为黑客设下陷阱,或充分击退攻击? 2020-05-10 02:22:52 +0000 UTC
  • Martin Hope
    Qwertiy 并变成3个无穷大 2020-11-06 07:15:57 +0000 UTC
  • Martin Hope
    koks_rs 什么是样板代码? 2020-10-27 15:43:19 +0000 UTC
  • Martin Hope
    Sirop4ik 向 git 提交发布的正确方法是什么? 2020-10-05 00:02:00 +0000 UTC
  • Martin Hope
    faoxis 为什么在这么多示例中函数都称为 foo? 2020-08-15 04:42:49 +0000 UTC
  • Martin Hope
    Pavel Mayorov 如何从事件或回调函数中返回值?或者至少等他们完成。 2020-08-11 16:49:28 +0000 UTC

热门标签

javascript python java php c# c++ html android jquery mysql

Explore

  • 主页
  • 问题
    • 热门问题
    • 最新问题
  • 标签
  • 帮助

Footer

RError.com

关于我们

  • 关于我们
  • 联系我们

Legal Stuff

  • Privacy Policy

帮助

© 2023 RError.com All Rights Reserve   沪ICP备12040472号-5