java-通过Servlet调用外部Web服务
作者：互联网
当前体系结构具有Web应用程序(以WAR分发),用于通过Servlet向Web客户端提供信息.该Servlet通过Glassfish Metro(SOAP)从外部服务中收集此信息,然后为客户端(JavaScript)相应地设置其格式.
已经开发了代理组件(JAR)来管理对该外部服务的访问(通过Glassfish Metro),并且当该组件通过命令行,JUnit测试甚至是Web项目时,可以完全访问和使用该外部服务.它作为命令行应用程序执行.
通过Glassfish执行此Web项目后,在尝试调用此服务(通过代理组件)时,Servlet就会遇到问题.
下面是堆栈跟踪：
java.lang.ClassCastException: org.apache.xerces.parsers.XML11Configuration cannot be cast to org.apache.xerces.xni.parser.XMLParserConfiguration
at org.apache.xerces.parsers.SAXParser.<init>(Unknown Source)
at org.apache.xerces.parsers.SAXParser.<init>(Unknown Source)
at org.apache.xerces.jaxp.SAXParserImpl.<init>(Unknown Source)
at org.apache.xerces.jaxp.SAXParserFactoryImpl.newSAXParser(Unknown Source)
at com.sun.org.apache.xml.internal.resolver.readers.SAXCatalogReader.readCatalog(SAXCatalogReader.java:238)
at com.sun.org.apache.xml.internal.resolver.Catalog.parseCatalog(Catalog.java:680)
at com.sun.xml.ws.util.xml.XmlUtil.createDefaultCatalogResolver(XmlUtil.java:299)
at com.sun.xml.ws.client.WSServiceDelegate.parseWSDL(WSServiceDelegate.java:267)
at com.sun.xml.ws.client.WSServiceDelegate.<init>(WSServiceDelegate.java:230)
at com.sun.xml.ws.client.WSServiceDelegate.<init>(WSServiceDelegate.java:178)
at com.sun.xml.ws.spi.ProviderImpl.createServiceDelegate(ProviderImpl.java:106)
at javax.xml.ws.Service.<init>(Service.java:57)
at com.acme.MLSWebServicesInterface.<init>(MLSWebServicesInterface.java:48)
at com.adomain.acme.MLSManager.getDeviceRecords(MLSManager.java:42)
at com.adomain.app.service.StatusManager.getDeviceRecords(StatusManager.java:22)
at com.adomain.app.service.StatusServlet.processRequest(StatusServlet.java:44)
at com.adomain.app.service.StatusServlet.doGet(StatusServlet.java:87)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:734)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1523)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97)
at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:332)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:233)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:165)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57)
at com.sun.grizzly.ContextTask.run(ContextTask.java:69)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309)
at java.lang.Thread.run(Thread.java:619)
解决方法:
从多个类加载器加载的类冲突似乎是一个问题.具体来说,您的应用程序似乎在其lib目录中具有自己的Xerces内部副本,这与Glassfish自己的副本冲突.
如果是这样,则无需从应用程序中删除副本.
标签：glassfish,java-metro-framework,web-services,java,soap 来源： https://codeday.me/bug/20191106/1998919.html