java.lang.UnsupportedClassVersionError - jdk版本

Question

我在 Windows 7 平台上使用 jdk 1.7.0_03 在 Eclipse 中开发了一个 API。部署在其他 Windows 7 系统上时运行良好。

使用jdk 1.6在Windows 8系统上部署它时，出现以下异常:

HTTP Status 500 - Servlet.init() for servlet MediaPlayer-Backend-API threw exception

type Exception report

message Servlet.init() for servlet MediaPlayer-Backend-API threw exception

description The server encountered an internal error that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Servlet.init() for servlet MediaPlayer-Backend-API threw exception
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:931)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1822)
    java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    java.lang.Thread.run(Thread.java:662)
root cause

java.lang.UnsupportedClassVersionError: favorite/api/VideoManager : Unsupported major.minor version 51.0 (unable to load class favorite.api.VideoManager)
    org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2908)
    org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1173)
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1681)
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
    java.lang.Class.forName0(Native Method)
    java.lang.Class.forName(Class.java:247)
    com.sun.jersey.core.reflection.ReflectionHelper$3.run(ReflectionHelper.java:284)
    com.sun.jersey.core.reflection.ReflectionHelper$3.run(ReflectionHelper.java:279)
    java.security.AccessController.doPrivileged(Native Method)
    com.sun.jersey.spi.scanning.AnnotationScannerListener$AnnotatedClassVisitor.getClassForName(AnnotationScannerListener.java:224)
    com.sun.jersey.spi.scanning.AnnotationScannerListener$AnnotatedClassVisitor.visitEnd(AnnotationScannerListener.java:188)
    org.objectweb.asm.ClassReader.accept(Unknown Source)
    org.objectweb.asm.ClassReader.accept(Unknown Source)
    com.sun.jersey.spi.scanning.AnnotationScannerListener.onProcess(AnnotationScannerListener.java:138)
    com.sun.jersey.core.spi.scanning.uri.FileSchemeScanner$1.f(FileSchemeScanner.java:86)
    com.sun.jersey.core.util.Closing.f(Closing.java:71)
    com.sun.jersey.core.spi.scanning.uri.FileSchemeScanner.scanDirectory(FileSchemeScanner.java:83)
    com.sun.jersey.core.spi.scanning.uri.FileSchemeScanner.scan(FileSchemeScanner.java:71)
    com.sun.jersey.core.spi.scanning.PackageNamesScanner.scan(PackageNamesScanner.java:226)
    com.sun.jersey.core.spi.scanning.PackageNamesScanner.scan(PackageNamesScanner.java:142)
    com.sun.jersey.api.core.ScanningResourceConfig.init(ScanningResourceConfig.java:80)
    com.sun.jersey.api.core.PackagesResourceConfig.init(PackagesResourceConfig.java:104)
    com.sun.jersey.api.core.PackagesResourceConfig.<init>(PackagesResourceConfig.java:78)
    com.sun.jersey.api.core.PackagesResourceConfig.<init>(PackagesResourceConfig.java:89)
    com.sun.jersey.spi.container.servlet.WebComponent.createResourceConfig(WebComponent.java:696)
    com.sun.jersey.spi.container.servlet.WebComponent.createResourceConfig(WebComponent.java:674)
    com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:205)
    com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:376)
    com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:559)
    javax.servlet.GenericServlet.init(GenericServlet.java:160)
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:931)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1822)
    java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    java.lang.Thread.run(Thread.java:662)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.33 logs.

Apache Tomcat/7.0.33

我提到了this answer并将 API Eclipse 项目的已安装 JRE 和编译器合规性级别更改为 jdk 1.5.0_15。

但是在部署 API 时我遇到了同样的错误。

有关出现问题以及如何使 API 与所有系统兼容的任何帮助吗？

Answer 1

您正在使用两个不同的 JDK 来运行该程序。 Java 不向后兼容，因此您必须在编译时使用的同一版本上运行。

jdk 1.7.0_03

和

jdk 1.6