JAXWS-RI WSGEN配置为使用特定的JDK

Question

我目前正在尝试使用ANT在CruiseControl中编译应用程序，但得到一个UnsupportedClassVersionError。设置如下：

• 环境：Windows服务器2012
• IDE：Eclipse的月神运行JDK 8
• 构建服务器：CruiseControl的2.4.1 JDK 6
• 构建工具运行：ANT
• 编译器：JDK 8更新102
• JAXWS-RI：2.2.10

CruiseControl是我作为服务安装并且在启动过程中，JAVA_HOME被设置为JDK 6，其名称为wrapper.conf。由于目标版本是Java 8，所以还设置了另一个env变量。

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

在Ant构建脚本javac任务有叉设置为true，并指定到Java可执行文件是这样的路径：

<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}"> 

上面的设置效果很好，但是当我尝试使用失败JAXWS-RI创建工件。报告特定的错误是：

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 

至于我可以看到它被抛出，因为WSGEN使用JAVA_HOME（指向JDK 6）找到Java可执行文件随后用于产生的东西。

WSSGEN设置是：

<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> 

我想配置WSGEN使用JDK 8代替JDK 6在编译，但我迄今未能如愿。有人知道我可以如何解决这个问题吗？我应该提到，升级CruiseControl以在JDK8上运行并不是一种选择。

Answer 1

的错误有以下...

Caused by: java.lang.UnsupportedClassVersionError: com/company/area/thing/services/Service1 : Unsupported major.minor version 52.0

/*snip*/

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

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

错误是说，在运行Ant的Java运行时（JRE的）的版本比JRE版本52.0以上。 JRE 52.0是Java SE 8的主要编号（请参阅How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version）。

运行Ant的JRE试图与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。

尝试运行Ant的与Java 8.设置JAVA_HOME指向JDK 8

使用以下build.xml脚本的安装验证的Java版本正在使用：

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

脚本应该输出类似的东西...

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