问题
i'm trying to deploy a rest application on tomcat7 that is running on ubuntu. After deploying the .war file using the application manager, when i access the url, its thrown me an exception.
It's important to say that, when i threw the .war on tomcat running on windows, it worked perfetly. I was running the latest versions of JRE and JDK.
I've tried everything i could find on the internet, but none worked so far. The error stack can be found below.
HTTP Status 500 - Servlet.init() for servlet Jersey Web Application threw exception
type Exception report
message Servlet.init() for servlet Jersey Web Application threw exception
description The server encountered an internal error that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: Servlet.init() for servlet Jersey Web Application threw exception org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423) org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079) org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625) org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316) java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) java.lang.Thread.run(Thread.java:745)
root cause
java.lang.UnsupportedClassVersionError: br/unicamp/ft/courseviewer/resource/TodasDisciplinasResource : Unsupported major.minor version 52.0 (unable to load class br.unicamp.ft.courseviewer.resource.TodasDisciplinasResource) org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:3111) org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1348) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1828) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1709) java.lang.Class.forName0(Native Method) java.lang.Class.forName(Class.java:278) org.glassfish.jersey.internal.util.ReflectionHelper$6.run(ReflectionHelper.java:374) org.glassfish.jersey.internal.util.ReflectionHelper$6.run(ReflectionHelper.java:369) java.security.AccessController.doPrivileged(Native Method) org.glassfish.jersey.server.internal.scanning.AnnotationAcceptingListener$AnnotatedClassVisitor.getClassForName(AnnotationAcceptingListener.java:257) org.glassfish.jersey.server.internal.scanning.AnnotationAcceptingListener$AnnotatedClassVisitor.visitEnd(AnnotationAcceptingListener.java:219) org.objectweb.asm.ClassReader.accept(ClassReader.java:1495) org.objectweb.asm.ClassReader.accept(ClassReader.java:425) org.glassfish.jersey.server.internal.scanning.AnnotationAcceptingListener.process(AnnotationAcceptingListener.java:169) org.glassfish.jersey.server.ResourceConfig.scanClasses(ResourceConfig.java:883) org.glassfish.jersey.server.ResourceConfig._getClasses(ResourceConfig.java:840) org.glassfish.jersey.server.ResourceConfig.getClasses(ResourceConfig.java:755) org.glassfish.jersey.server.ResourceConfig$RuntimeConfig.(ResourceConfig.java:1171) org.glassfish.jersey.server.ResourceConfig$RuntimeConfig.(ResourceConfig.java:1144) org.glassfish.jersey.server.ResourceConfig.createRuntimeConfig(ResourceConfig.java:1140) org.glassfish.jersey.server.ApplicationHandler.(ApplicationHandler.java:299) org.glassfish.jersey.servlet.WebComponent.(WebComponent.java:311) org.glassfish.jersey.servlet.ServletContainer.init(ServletContainer.java:169) org.glassfish.jersey.servlet.ServletContainer.init(ServletContainer.java:359) javax.servlet.GenericServlet.init(GenericServlet.java:158) org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423) org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079) org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625) org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316) java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) java.lang.Thread.run(Thread.java:745)
This is my jdk version.
java version "1.7.0_101"
OpenJDK Runtime Environment (IcedTea 2.6.6) (7u101-2.6.6-0ubuntu0.15.10.1)
OpenJDK 64-Bit Server VM (build 24.95-b01, mixed mode)
Both JRE_HOME and JAVA_HOME are pointing to the right place /usr/lib/jvm/jre1.7.0_79 and /usr/lib/jvm/java-1.7.0-openjdk-amd64
回答1:
You have a mismatch in Java version on your local machine and your Ubuntu server. I think you have Java 8 on your local machine that you used to generate your war file. You should either update Java on your server or compile with a JDK 7 to generate your war file. You can use your IDE to compile with a different version.
来源：https://stackoverflow.com/questions/37448655/servlet-init-exception-running-jersey-servlet-on-tomcat-7