在Spring WebApp中使用Elasticsearch客户端时出现链接错误

时间：2014-01-10 11:26:01

标签： java spring jsp elasticsearch

尝试在我的WebApp中包含Elasticsearch java客户端时遇到问题。我有所需的依赖项，我正在初始化/销毁Spring bean中创建客户端（作为一个简单的测试），如下所示：

    @Override
public void afterPropertiesSet() throws Exception {
    try {
        client = new TransportClient();
        InetSocketTransportAddress addr = new InetSocketTransportAddress("localhost", 9300);
        ((TransportClient) client).addTransportAddress(addr);
    } 
    catch(Exception e){
        System.out.println(e.toString());
    }
}

相应的destroy（）将关闭客户端。

一切看起来都很好并且上下文开始正常但是在访问JSP时我收到以下异常：

SEVERE: Servlet.service() for servlet [jsp] in context with path [/Fountain] threw           exception [Filter execution threw an exception] with root cause
java.lang.LinkageError: loader constraint violation in interface itable initialization: when resolving method "javax.servlet.ServletResponseWrapper.getOutputStream()Ljavax/servlet/ServletOutputStream;" the class loader (instance of org/apache/catalina/loader/WebappClassLoader) of the current class, javax/servlet/ServletResponseWrapper, and the class loader (instance of org/apache/catalina/loader/StandardClassLoader) for interface javax/servlet/ServletResponse have different Class objects for the type vlet/ServletOutputStream; used in the signature
    at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:186)
at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:181)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:581)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:722)

Jan 10, 2014 10:44:46 AM org.apache.catalina.core.ApplicationDispatcher invoke
SEVERE: Servlet.service() for servlet jsp threw exception
java.lang.LinkageError: loader constraint violation: when resolving method "javax.servlet.jsp.JspFactory.getPageContext(Ljavax/servlet/Servlet;Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Ljava/lang/String;ZIZ)Ljavax/servlet/jsp/PageContext;" the class loader (instance of org/apache/jasper/servlet/JasperLoader) of the current class, org/apache/jsp/jsp/ajaxerror_jsp, and the class loader (instance of org/apache/catalina/loader/StandardClassLoader) for resolved class, javax/servlet/jsp/JspFactory, have different Class objects for the type t/ServletRequest;Ljavax/servlet/ServletResponse;Ljava/lang/String;ZIZ)Ljavax/servlet/jsp/PageContext; used in the signature
at org.apache.jsp.jsp.ajaxerror_jsp._jspService(ajaxerror_jsp.java:59)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:489)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:412)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:467)
at org.apache.catalina.core.StandardHostValve.throwable(StandardHostValve.java:412)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:201)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:722)

Jan 10, 2014 10:44:46 AM org.apache.catalina.core.StandardHostValve custom
SEVERE: Exception Processing ErrorPage[exceptionType=java.lang.Throwable,      location=/jsp/ajaxerror.jsp]
org.apache.jasper.JasperException: javax.servlet.ServletException: java.lang.LinkageError: loader constraint violation: when resolving method "javax.servlet.jsp.JspFactory.getPageContext(Ljavax/servlet/Servlet;Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Ljava/lang/String;ZIZ)Ljavax/servlet/jsp/PageContext;" the class loader (instance of org/apache/jasper/servlet/JasperLoader) of the current class, org/apache/jsp/jsp/ajaxerror_jsp, and the class loader (instance of org/apache/catalina/loader/StandardClassLoader) for resolved class, javax/servlet/jsp/JspFactory, have different Class objects for the type t/ServletRequest;Ljavax/servlet/ServletResponse;Ljava/lang/String;ZIZ)Ljavax/servlet/jsp/PageContext; used in the signature
at org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:549)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:455)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:489)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:412)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:467)
at org.apache.catalina.core.StandardHostValve.throwable(StandardHostValve.java:412)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:201)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:722)
Caused by: javax.servlet.ServletException: java.lang.LinkageError: loader constraint violation: when resolving method    "javax.servlet.jsp.JspFactory.getPageContext(Ljavax/servlet/Servlet;Ljavax/servlet/ServletR equest;Ljavax/servlet/ServletResponse;Ljava/lang/String;ZIZ)Ljavax/servlet/jsp/PageContext;" the class loader (instance of org/apache/jasper/servlet/JasperLoader) of the current class, org/apache/jsp/jsp/ajaxerror_jsp, and the class loader (instance of org/apache/catalina/loader/StandardClassLoader) for resolved class, javax/servlet/jsp/JspFactory, have different Class objects for the type t/ServletRequest;Ljavax/servlet/ServletResponse;Ljava/lang/String;ZIZ)Ljavax/servlet/jsp/PageContext; used in the signature
at org.apache.jsp.jsp.ajaxerror_jsp._jspService(ajaxerror_jsp.java:130)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
... 22 more
Caused by: java.lang.LinkageError: loader constraint violation: when resolving method "javax.servlet.jsp.JspFactory.getPageContext(Ljavax/servlet/Servlet;Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Ljava/lang/String;ZIZ)Ljavax/servlet/jsp/PageContext;" the class loader (instance of org/apache/jasper/servlet/JasperLoader) of the current class, org/apache/jsp/jsp/ajaxerror_jsp, and the class loader (instance of org/apache/catalina/loader/StandardClassLoader) for resolved class, javax/servlet/jsp/JspFactory, have different Class objects for the type t/ServletRequest;Ljavax/servlet/ServletResponse;Ljava/lang/String;ZIZ)Ljavax/servlet/jsp/PageContext; used in the signature
at org.apache.jsp.jsp.ajaxerror_jsp._jspService(ajaxerror_jsp.java:59)
... 25 more

如果没有这个，上下文将启动并正确地为JSP提供服务。

有没有人有任何想法可能导致这个？我假设elasticsearch客户端正在使用web-app所需的类，但在不同的类加载器中进行实例化。

我尝试使用ImmutableSettings明确设置弹性搜索使用的类加载器，但这似乎没有任何区别：

    ClassLoader contextClassLoader = thread.getContextClassLoader();
    try {
        //thread.setContextClassLoader(ClassLoader.getSystemClassLoader());
        Settings s = ImmutableSettings.settingsBuilder()
                .classLoader(contextClassLoader)
                .build();

任何帮助将不胜感激！谢谢！

2 个答案:

答案 0 :(得分：1)

好的，设法解决了这个问题：

获取tomcat'common'类加载器的引用并将其传递给Elasticsearch客户端：

ClassLoader contextClassLoader = thread.getContextClassLoader();
try {
        Settings settings = ImmutableSettings.settingsBuilder().classLoader(contextClassLoader.getParent()).build();            
        client = new TransportClient(settings);

这样做的副作用是names.txt文件必须从elasticSearch jar移动到'common'类路径上的某个地方。

我仍然没有找到为什么这个问题影响我的特定堆栈，而不是其他人，但目的是这样做并在这里更新。

答案 1 :(得分：0)

解决方案是创建弹性网络客户端，如下所示：

Settings settings = ImmutableSettings.settingsBuilder()
.put(“path.plugins”, “fakeDirectory:\\”)
.build();

TransportClient client = new TransportClient(settings);

我放了一个假目录，因为ElasticSearch在开始加载所有eclipse插件时使用它，但我知道为什么!! （请参阅org.elasticsearch.plugins.PluginsService类）。

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