ant gwt编译器任务失败

Question

我按照本教程创建java编译的ant构建文件，而不是GWT编译，而不是执行正确的操作来构建我的. war文件。

我使用Eclipse和GWT-compile作品，当我运行开发模式时，它是有效的。我也成功地部署在tomcat上。

问题是，当我运行脚本时，编译工作正常，但它在gwt编译器任务中失败。我的ant构建脚本如下：

<project name="vlp" default="gwt.compile" basedir=".">
    <tstamp />
    <!-- ################# PROPERTIES ################ -->
    <!-- directory properties -->
    <!-- source -->
    <property name="projectName" value="VirtualLabPortal" />
    <property name="src.dir" location="src" />
    <property name="build.dir" location="bin" />
    <property name="src.build.dir" location="${build.dir}/src" />
    <property name="gwt.build.dir" location="${build.dir}/gwt" />
    <property name="gwt.unitCache.dir" location="gwt-unitCache" />
    <!-- libraries -->
    <property name="src.lib.dir" location="war/WEB-INF/lib" />

    <!-- ___________________________________________________________________
        |                                                                   |
        |               Configure path source/test                          |
        |___________________________________________________________________| 
    -->
    <path id="compile.path">
        <fileset dir="${src.lib.dir}" includes="*.jar" />
        <fileset dir="${src.lib.dir}/gwt" includes="*.jar" />
    </path>
    <!-- ___________________________________________________________________
        |                                                                   |
        |               Clean old compiled source/test/war                  |
        |___________________________________________________________________| 
    -->
    <target name="clean" description="Clean all the old build files.">
        <delete dir="${build.dir}" />
        <delete dir="${gwt.unitCache.dir}" />
        <delete file="${projectWar}" />
        <delete file="${src.lib.dir}/${projectJar}" />
    </target>
    <!-- ___________________________________________________________________
        |                                                                   |
        |                       Compile the source                          |
        |(should exclude gwtview code which is compiled by the gwt compiler)|   
        |___________________________________________________________________| 
    -->
    <target name="src.compile" depends="clean" description="Compile the source code when everything has been cleaned.">
        <mkdir dir="${src.build.dir}" />
        <javac encoding="utf-8" destdir="${src.build.dir}" nowarn="true">
            <src path="${src.dir}" />
            <classpath refid="compile.path" />
        </javac>
    </target>
    <!-- ___________________________________________________________________
        |                                                                   |
        |                       Invoke the GWT compiler                     |
        |___________________________________________________________________| 
    -->
    <property name="module.gwt.xml" location="${src.dir}/com/banctecmtl/ca/vlp" />
    <target name="gwt.compile" depends="src.compile">
        <java failonerror="true" fork="true" classname="com.google.gwt.dev.Compiler">
            <classpath>
                <!-- src dir is added to ensure the module.xml file(s) are on the classpath -->
                <pathelement location="${module.gwt.xml}" />
                <path refid="compile.path" />
            </classpath>
            <jvmarg value="-Xmx512m" />
            <arg line="${projectName} -logLevel ALL -style OBF -war ${build.dir}" />
        </java>
    </target>
    <!-- ___________________________________________________________________
        |                                                                   |
        |           Copy the config files in the war directory              |
        |___________________________________________________________________| 
    -->
    <property name="config.dir" location="war/config" />
    <target name="copy-resources">
        <copy todir="war/config" preservelastmodified="true">
            <fileset dir="${config.dir}">
                <include name="**.*" />
            </fileset>
        </copy>
    </target>
    <!-- ___________________________________________________________________
        |                                                                   |
        |           Create a Jar to be included in the war                  |
        |___________________________________________________________________| 
    -->
    <property name="projectJar" value="${projectName}.jar" />
    <property name="gwt.client.dir" location="com/banctecmtl/ca/vlp/view/webview" />
    <target name="jar" depends="src.compile">
        <!-- should also depend on gwt.compile -->
        <jar jarfile="${src.lib.dir}/${projectJar}" basedir="${src.build.dir}/">
            <!-- Don't wrap any of the client only code into the JAR
                <exclude name="${gwt.client.dir}/**/*.class"/> -->
            <exclude name="${gwt.client.dir}/**/*.class" />
        </jar>
    </target>
    <!-- ___________________________________________________________________
        |                                                                   |
        |                   Create a War from the source                    |
        |___________________________________________________________________| 
    -->
    <property name="projectWar" value="${projectName}.war" />
    <target name="war" depends="jar,copy-resources">
        <war basedir="war" destfile="${projectWar}" webxml="war/WEB-INF/web.xml">
            <exclude name="WEB-INF/**" />
            <webinf dir="war/WEB-INF/">
                <include name="lib/*.jar" />
                <include name="classes/*.properties" />
                <exclude name="**/gwt-dev.jar" />
                <exclude name="**/gwt-user.jar" />
            </webinf>
        </war>
    </target>

    <!-- ___________________________________________________________________
        |                                                                   |
        |                   Deploy to the production server                 |
        |___________________________________________________________________| 
    -->
    <!-- It is possible you can't run this from eclipse,
     you need to edit the run configurations and add the 
     latest jsch library to the classpath -->
    <property name="user" value="root" />
    <property name="password" value="Banctec01" />
    <property name="prodHost" value="vlp" />
    <property name="dest" value="/usr/share/tomcat6/webapps/ROOT.war" />
    <target name="deploy" depends="war">
        <echo message="Copying to : ${user}@${prodHost}:${dest}" />
        <scp file="${projectWar}" remoteTofile="${user}@${prodHost}:${dest}" password="${password}" trust="true" />
    </target>
</project>

它失败，出现以下错误：

Buildfile: D:\workspace\vlp\build.xml
clean:
   [delete] Deleting directory D:\workspace\vlp\war\WEB-INF\classes
src.compile:
    [mkdir] Created dir: D:\workspace\vlp\war\WEB-INF\classes
    [javac] D:\workspace\vlp\build.xml:42: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds
    [javac] Compiling 134 source files to D:\workspace\vlp\war\WEB-INF\classes
    [javac] Note: D:\workspace\vlp\src\com\banctecmtl\ca\vlp\controller\schedule\ScheduledTaskManager.java uses unchecked or unsafe operations.
    [javac] Note: Recompile with -Xlint:unchecked for details.
gwt.compile:
     [java] Checking for updates
     [java]    First launch was 134c3e23387
     [java]    Last ping was Mon Apr 23 14:42:48 EDT 2012, min wait is 86400000ms
     [java] Module location: file:/D:/workspace/vlp/src/com/banctecmtl/ca/vlp/VirtualLabPortal.gwt.xml
     [java] Loading inherited module 'com.google.gwt.user.User'
     [java]    Module location: jar:file:/D:/workspace/vlp/war/WEB-INF/lib/gwt/gwt-user.jar!/com/google/gwt/user/User.gwt.xml
     [java]    Loading inherited module 'com.google.gwt.animation.Animation'
     [java]       Module location: jar:file:/D:/workspace/vlp/war/WEB-INF/lib/gwt/gwt-user.jar!/com/google/gwt/animation/Animation.gwt.xml
     [java]       Loading inherited module 'com.google.gwt.core.Core'
     [java]          Module location: jar:file:/D:/workspace/vlp/war/WEB-INF/lib/gwt/gwt-user.jar!/com/google/gwt/core/Core.gwt.xml
     [java]          Loading inherited module 'com.google.gwt.dev.jjs.intrinsic.Intrinsic'
     [java]             Module location: jar:file:/D:/workspace/vlp/war/WEB-INF/lib/gwt/gwt-dev.jar!/com/google/gwt/dev/jjs/intrinsic/Intrinsic.gwt.xml
     [java]             Loading inherited module 'com.google.gwt.lang.LongLib'
     [java]                Module location: jar:file:/D:/workspace/vlp/war/WEB-INF/lib/gwt/gwt-dev.jar!/com/google/gwt/lang/LongLib.gwt.xml
     [java]          Loading inherited module 'com.google.gwt.emul.Emulation'
     [java]             Module location: jar:file:/D:/workspace/vlp/war/WEB-INF/lib/gwt/gwt-user.jar!/com/google/gwt/emul/Emulation.gwt.xml
     [java]             Loading inherited module 'com.google.gwt.logging.LogImpl'
     [java]                Module location: jar:file:/D:/workspace/vlp/war/WEB-INF/lib/gwt/gwt-user.jar!/com/google/gwt/logging/LogImpl.gwt.xml
     [java]          Loading inherited module 'com.google.gwt.xhr.XMLHttpRequest'
     [java]             Module location: jar:file:/D:/workspace/vlp/war/WEB-INF/lib/gwt/gwt-user.jar!/com/google/gwt/xhr/XMLHttpRequest.gwt.xml
     [java]             Loading inherited module 'com.google.gwt.core.Core'
     [java]                Module 'com.google.gwt.core.Core' has already been loaded and will be skipped
     [java]          Loading inherited module 'com.google.gwt.core.CompilerParameters'
     [java]             Module location: jar:file:/D:/workspace/vlp/war/WEB-INF/lib/gwt/gwt-user.jar!/com/google/gwt/core/CompilerParameters.gwt.xml
     [java]          [...]
     [java]    Loading inherited module 'com.google.gwt.user.User'
     [java]       Module 'com.google.gwt.user.User' has already been loaded and will be skipped
     [java] Public resources found in...
     [java] Translatable source found in...
     [java] Persistent unit cache dir set to: D:\workspace\vlp\war\..\gwt-unitCache
     [java] Compiling module VirtualLabPortal
     [java] Looking for previously cached Compilation Units in D:\workspace\vlp\war\..\gwt-unitCache
     [java] Loaded 0 units from persistent store.
     [java] Starting UnitWriteThread.
     [java]    Found 0 cached units.  Used 0 / 2413 units from cache.
     [java] [ERROR] Unexpected internal compiler error
     [java] java.lang.RuntimeException: Exception processing units
     [java]     at com.google.gwt.dev.javac.CompilationStateBuilder$CompileMoreLater.compile(CompilationStateBuilder.java:248)
     [java]     at com.google.gwt.dev.javac.CompilationStateBuilder.doBuildFrom(CompilationStateBuilder.java:447)
     [java]     at com.google.gwt.dev.javac.CompilationStateBuilder.buildFrom(CompilationStateBuilder.java:370)
     [java]     at com.google.gwt.dev.cfg.ModuleDef.getCompilationState(ModuleDef.java:360)
     [java]     at com.google.gwt.dev.Precompile.precompile(Precompile.java:252)
     [java]     at com.google.gwt.dev.Precompile.precompile(Precompile.java:233)
     [java]     at com.google.gwt.dev.Precompile.precompile(Precompile.java:145)
     [java]     at com.google.gwt.dev.Compiler.run(Compiler.java:232)
     [java]     at com.google.gwt.dev.Compiler.run(Compiler.java:198)
     [java]     at com.google.gwt.dev.Compiler$1.run(Compiler.java:170)
     [java]     at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:88)
     [java]     at com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:82)
     [java]     at com.google.gwt.dev.Compiler.main(Compiler.java:177)
     [java] Caused by: java.lang.NoSuchMethodError: com.google.gwt.dev.jjs.ast.JProgram.serializeTypes(Ljava/util/List;Ljava/io/ObjectOutputStream;)V
     [java]     at com.google.gwt.dev.javac.CompilationUnitImpl.<init>(CompilationUnitImpl.java:68)
     [java]     at com.google.gwt.dev.javac.SourceFileCompilationUnit.<init>(SourceFileCompilationUnit.java:48)
     [java]     at com.google.gwt.dev.javac.CompilationUnitBuilder$ResourceCompilationUnitBuilder.makeUnit(CompilationUnitBuilder.java:154)
     [java]     at com.google.gwt.dev.javac.CompilationUnitBuilder.build(CompilationUnitBuilder.java:266)
     [java]     at com.google.gwt.dev.javac.CompilationStateBuilder$CompileMoreLater$1.run(CompilationStateBuilder.java:223)

BUILD FAILED
D:\workspace\vlp\build.xml:60: Java returned: 1

Total time: 36 seconds

我发现将gwt编译器类名更改为DevMode是成功的。使用：classname=“com.google.gwt.dev.DevMode”而不是classname=“com.google.gwt.dev.Compiler”。

编辑：我重构了上面的XML。build.xml清理了所有bin目录。我还将javac指向bin/src目录，并将Google Web Toolkit编译器输出到：bin/gwt。编译器仍然不工作...

编辑：我下载了最新的SDK马上从谷歌开发网站，并覆盖了旧的库中找到我的类路径和我的eclipse插件。仍然无法与蚂蚁构建脚本。

有人看出这里有什么问题吗？

Answer 1

JAVAio。GWT编译器不支持ObjectOutputStream类
您必须参考https://developers.google.com/web-toolkit/doc/latest/RefJreEmulation#Package_java_io在使用Java类之前，请确保GWT支持它。

Answer 2

tl；dr：这是因为在类上下文不足或不正确的情况下，编译器提供的链接器与DevMode提供的链接器不同

我注意到您的重现存在于当前的GWT主干中。具体来说，它在这个代码块中失败了：

ArrayList<CompilationUnit> resultUnits = new ArrayList<CompilationUnit>();
      do {
        // Compile anything that needs to be compiled.
        buildQueue = new LinkedBlockingQueue<CompilationUnitBuilder>();
        final ArrayList<CompilationUnit> newlyBuiltUnits = new ArrayList<CompilationUnit>();
        final CompilationUnitBuilder sentinel = CompilationUnitBuilder.create((GeneratedUnit) null);
        final Throwable[] workerException = new Throwable[1];
        Thread buildThread = new Thread() {
          @Override
          public void run() {
            try {
              do {
                CompilationUnitBuilder builder = buildQueue.take();
                if (builder == sentinel) {
                  return;
                }
                // Expensive, must serialize GWT AST types to bytes.
                CompilationUnit unit = builder.build(); // <-- Right here.
                newlyBuiltUnits.add(unit);
              } while (true);
            } catch (Throwable e) {
              workerException[0] = e;
            }
          }
        };

将堆栈展开到比跟踪更远的地方，我们通过一个工厂和十层代码跳转，直到最终找到UnifyAst。JAVA你瞧：

...
mapApi(enclosingType);

// Now the method should be there.
method = methodMap.get(sig);
if (method == null) {
  // TODO: error logging
  throw new NoSuchMethodError(sig);
}
assert !method.isExternal();
return method;
...

这是GWT的预编译阶段调用的NoSuchMethodError的唯一实例。

酷。现在我们已经深入探讨了为什么这会爆炸，让我们弄清楚为什么DevMode在Compiler不起作用时仍然有效。我们注意到两者都导入了相同的Util.java副本，因此从技术上讲，这两种类型对我们的Java编译器（只是GWT编译器不可用）都是静态可用的。

检查链接器时，我们注意到编译器使用链接。直接链接：

Link.link(logger.branch(TreeLogger.TRACE, logMessage), module,
          generatedArtifacts, allPerms, resultFiles, options.getWarDir(),
          options.getDeployDir(), options.getExtraDir(), precompileOptions); 

然而，DevMode使用了一个更加简洁的静态调用，在StandardLinkerContext的实例中填充了一个单独的过程：

link(loadLogger, module);

...

@Override
protected synchronized void produceOutput(TreeLogger logger, StandardLinkerContext linkerStack,
      ArtifactSet artifacts, ModuleDef module, boolean isRelink) throws UnableToCompleteException {

    ...
    linkerStack.produceOutput(linkLogger, artifacts, Visibility.Public, outFileSet);
    linkerStack.produceOutput(linkLogger, artifacts, Visibility.Deploy, deployFileSet);
    linkerStack.produceOutput(linkLogger, artifacts, Visibility.Private, extraFileSet);
    ...
}

正如在写这篇文章的过程中所接受的那样，yair为这个问题提供了一个这样的诊断，指出在两个版本的GWT的上下文中，预编译步骤对于冲突的类标识是不健壮的。其他类可见性问题，其中预编译。getGeneratedArtifacts（） 拉入错误或不足的对象也可能导致此复制。

鉴于yair获得了可接受的回答状态，我假设问题现在已经解决。但可以想象，其他人看到这篇文章时，其他类路径或可见性问题可能会导致这一问题再次出现。

Answer 3

我所能说的就是这个方法。谷歌。gwt。dev.jjs。ast。JP程序。serializeTypes（Ljava/util/List；Ljava/io/ObjectOutputStream；）V仅在gwt dev 2.4.0中引入。它在gwt dev 2.3.0中不存在。

这意味着在类路径中有两个gwt开发版本。其中之一是2.4.0，这就是为什么com.google.gwt。dev.javac。CompliationUnitImpl正在寻找该方法。另一个是2.3.0或更旧版本，这就是为什么找不到该方法（编译器使用旧版本加载了JProgram类）。

尽量彻底地查找它们。或者试着开始一个全新的环境，在这个环境中，你可以很好地关注正在发生的事情。