Question

我目前正在尝试使用ANT在CruiseControl中编译应用程序但是获得了UnsupportedClassVersionError。设置如下：

环境：Windows Server 2012
IDE：运行JDK 8的Eclipse Luna
构建服务器：在JDK 6上运行CruiseControl 2.4.1
构建工具：ANT
编译器：JDK 8 update 102
JAXWS-RI：2.2.10

CruiseControl作为服务安装，在启动期间，JAVA_HOME在名为 wrapper.conf 的文件中设置为JDK 6。由于目标版本是Java 8，因此还设置了另一个env变量。

set.JAVA_HOME=C:/jdk1.6
set.JAVA_HOME_JDK8=C:/jdk1.8.0_102

在ANT构建脚本中，javac任务将fork设置为true，并指定java可执行文件的路径，如下所示：

<property name="javac.fork" value="yes"/>
<property environment="env"/>
<property name="javac.location" value="${env.JAVA_HOME_JDK8}\\bin\\javac.exe"/>

<javac includeantruntime="false" destdir="${builddir}" debug="true"
 target="1.8" source="1.8" debuglevel="lines,vars,source" 
 fork="${javac.fork}" executable="${javac.location}">

上述设置运行良好但在我尝试使用JAXWS-RI创建工件时失败。报告的具体错误是：

java.lang.UnsupportedClassVersionError: com/company/area/thing/services/Service1 : Unsupported major.minor version 52.0
    at org.apache.tools.ant.ProjectHelper.addLocationToBuildException(ProjectHelper.java:539)
    at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:384)
    at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
    at org.apache.tools.ant.Task.perform(Task.java:364)
    at org.apache.tools.ant.Target.execute(Target.java:341)
    at org.apache.tools.ant.Target.performTasks(Target.java:369)
    at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)
    at org.apache.tools.ant.Project.executeTarget(Project.java:1185)
    at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:40)
    at org.apache.tools.ant.Project.executeTargets(Project.java:1068)
    at org.apache.tools.ant.Main.runBuild(Main.java:668)
    at org.apache.tools.ant.Main.startAnt(Main.java:187)
    at org.apache.tools.ant.launch.Launcher.run(Launcher.java:246)
    at org.apache.tools.ant.launch.Launcher.main(Launcher.java:67)
Caused by: C:\path\build.xml:133: The following error occurred while executing this line:
java.lang.UnsupportedClassVersionError: com/company/area/thing/services/Service1 : Unsupported major.minor version 52.0
    at org.apache.tools.ant.ProjectHelper.addLocationToBuildException(ProjectHelper.java:539)
    at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:384)
    at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
    at org.apache.tools.ant.Task.perform(Task.java:364)
    at org.apache.tools.ant.Target.execute(Target.java:341)
    at org.apache.tools.ant.Target.performTasks(Target.java:369)
    at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)
    at org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:37)
    at org.apache.tools.ant.Project.executeTargets(Project.java:1068)
    at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:382)
    ... 12 more
Caused by: java.lang.UnsupportedClassVersionError: com/company/area/thing/services/Service1 : Unsupported major.minor version 52.0
    at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1225)
    at org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:37)
    at org.apache.tools.ant.Project.executeTargets(Project.java:1068)
    at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:382)
    ... 20 more
Caused by: java.lang.UnsupportedClassVersionError: com/company/area/thing/services/Service1 : Unsupported major.minor version 52.0
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
    at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
    at com.sun.tools.ws.wscompile.WsgenOptions.getClass(WsgenOptions.java:305)
    at com.sun.tools.ws.wscompile.WsgenOptions.validateEndpointClass(WsgenOptions.java:244)
    at com.sun.tools.ws.wscompile.WsgenOptions.validate(WsgenOptions.java:235)
    at com.sun.tools.ws.wscompile.WsgenTool.run(WsgenTool.java:131)
    at com.sun.tools.ws.ant.WsGen2.runInVm(WsGen2.java:357)
    at com.sun.tools.ws.ant.WsTask2.execute(WsTask2.java:423)
    at com.sun.tools.ws.ant.WsGen2.execute(WsGen2.java:351)
    at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
    at org.apache.tools.ant.Task.perform(Task.java:364)
    at org.apache.tools.ant.Target.execute(Target.java:341)
    at org.apache.tools.ant.Target.performTasks(Target.java:369)
    at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)
    ... 23 more

据我所知，它被抛出，因为WSGEN使用JAVA_HOME（指向JDK 6）来查找随后用于生成内容的Java可执行文件。

WSSGEN设置为：

<target name="wsgen-compile">
    <mkdir dir="${builddir}"/>
    <javac includeantruntime="false" destdir="${builddir}" debug="true" target="1.8" source="1.8" debuglevel="lines,vars,source" fork="${javac.fork}" executable="${javac.location}">    
        <src path="${src.tmp}" />    
        <classpath>    
            <pathelement path="${classpath}"/>    
            <pathelement path="${builddir}/../../common/bin"/>    
            <pathelement path="${builddir}/../../server/bin"/>    
            <fileset dir="${libdir}">    
                <include name="*.jar"/>    
            </fileset>    
        </classpath>    
    </javac>    
</target>    

<target name="wsgen-generate">    
    <taskdef name="wsgen" classname="com.sun.tools.ws.ant.WsGen2">    
        <classpath>    
            <fileset dir="${webserviceslibdir}/jax/jaxws-ri/lib">    
                <include name="*.jar"/>    
            </fileset>    
        </classpath>                
    </taskdef>    

    <wsgen verbose="true"    
            genwsdl="true"    
            xendorsed="false"    
            keep="true"    
            resourcedestdir="properties"    
            destdir="${src.tmp}"    
            sei="com.nordea.nordiccms.server.webservices.${service}">               
        <classpath>    
            <pathelement path="${classpath}"/>    
            <pathelement path="${builddir}/../../common/bin"/>    
            <pathelement path="${builddir}/../../server/bin"/>    
            <fileset dir="${libdir}">    
                <include name="*.jar"/>    
            </fileset>    
        </classpath>     
        <arg value="J.java_home"/>    
    </wsgen>    

    <delete>    
        <fileset dir="${src.tmp}">    
            <include name="**/*.class"/>    
        </fileset>    
    </delete>    
</target>    

<target name="wsgen" depends="compile">    
    <echo message=""/>    
    <echo message="Building ${distributionnameserver} WebService files"/>    
    <echo message="----------"/>    
    <mkdir dir="${builddir}/wsgen"/>    

    <delete dir="${src.tmp}"/>    
    <mkdir dir="${src.tmp}"/>    

    <ant target="wsgen-generate">    
        <property name="service" value="Service1"/>    
    </ant>          

    <ant target="wsgen-compile"/>        
    <delete dir="${src.tmp}"/>    
</target>

我想在编译时将WSGEN配置为使用JDK 8而不是JDK 6，但到目前为止我还是无法这样做。有谁知道我怎么解决这个问题？我应该提一下，升级CruiseControl以在JDK8上运行不是一个选择。

Answer 1

错误有以下内容......

引起：java.lang.UnsupportedClassVersionError：com / company / area / thing / services / Service1：不支持的major.minor版本52.0

/ * *剪断/

在java.lang.ClassLoader.loadClass（ClassLoader.java:251）

at com.sun.tools.ws.wscompile.WsgenOptions.getClass（WsgenOptions.java:305）

错误是说运行Ant的Java Runtime（JRE）的版本早于JRE版本52.0。 JRE 52.0是Java SE 8的主要编号（参见How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version）。

运行Ant的JRE正在尝试与Java类com/company/area/thing/services/Service1进行交互。但是，Service1类是使用Java 8编译的。运行Ant的旧JRE不知道如何处理Java 8类，因此构建失败。

尝试使用Java 8运行Ant。将JAVA_HOME设置为指向JDK 8的安装。

使用以下build.xml脚本验证正在使用的Java版本：

<project name="ant-jdk-version">
    <echo>Java Version via Ant: ${ant.java.version}</echo>
    <echo>Java Version System Prop: ${java.version}</echo>
</project>

脚本应该输出类似于......的内容。

 [echo] Java Version via Ant: 1.8
 [echo] Java Version System Prop: 1.8.0_60

JAXWS-RI WSGEN配置为使用特定的JDK

1 个答案: