gwt - ant gwt 编译器任务失败

Question

我正在按照本教程创建 java 编译的我的 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 工作，当我运行开发模式时它工作。我也成功部署在tomcat上。

事情是当我运行我的脚本时，编译工作但它在 gwt-compiler 任务上失败。我的蚂蚁构建脚本如下：

<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>

它失败并出现以下错误：

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-compiler 类名更改为 DevMode 正在成功构建。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 清除所有 bin 目录。我还将指向javac目录bin/src和 Google Web Toolkit 编译器输出的指针指向 : bin/gwt。编译器还是不行...

编辑：我立即从谷歌开发者网站下载了最新的 SDK，并覆盖了在我的类路径和我的 Eclipse 插件中找到的旧库。仍然无法使用 ant 构建脚本。

有人知道这里可能是什么问题吗？

Answer 1

我只能说该方法com.google.gwt.dev.jjs.ast.JProgram.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的某个地方，有两个 gwt-dev 版本。其中之一是 2.4.0，这就是com.google.gwt.dev.javac.CompilationUnitImpl寻找该方法的原因。另一个是 2.3.0 或更早版本，这就是找不到该方法的原因（JProgram编译器使用旧版本加载了类）。

尝试彻底查找它们。或者尝试开始一个新的环境，在其中你密切关注正在发生的事情。

Answer 2

tl;dr：这是由于在类上下文不充分或不正确的情况下提供的Compiler链接器存在差异DevMode

追踪问题

我注意到您拥有的复制品存在于当前GWT 主干中。具体来说，它在这段代码中失败了：

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;
            }
          }
        };

展开堆栈比您的跟踪更远，我们通过一个工厂和十层代码反弹，直到我们最终点击UnifyAst.java。而且，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;
...

NoSuchMethodError这是GWT 的预编译阶段调用的唯一实例。

Compiler 和 DevMode 链接的差异

凉爽的。既然我们已经深入研究了为什么会爆炸，那么让我们弄清楚为什么会DevMode起作用，而Compiler不会起作用。我们注意到两者都导入了Util.java的相同副本，因此从技术上讲，这两种类型都可以静态地用于我们的 Java 编译器（只是不是 GWT 编译器）。

检查链接器，我们注意到直接Compiler使用Link.link：

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

而DevMode使用更简洁的静态调用，并使用单独的传递填充以下实例StandardLinkerContext：

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);
    ...
}

伟大的！那么，我该如何解决呢？

正如在写这篇文章的中间所接受的那样，yair为这个问题提供了一个这样的诊断，并指出在两个版本的 GWT 的上下文中，预编译步骤对于冲突的类身份是非鲁棒的。precompilation.getGeneratedArtifacts();拉入错误或不足对象的其他类可见性问题也可能导致此重现。

鉴于 yair 已获得接受的答案状态，我将假设问题现已解决。但是对于其他在这篇文章中运行的人来说，可以想象其他类路径或可见性问题可能会导致这个确切的问题再次发生。

Answer 3

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

Answer 4

你 fork 一个 JVM 来运行 Gwt Compiler 并且bin目录在 ClassPath 中。

由于 Eclipse 在开发模式下编译，剩余的类bin可能会阻止编译器正确处理某些源文件。

在调用 Ant 目标之前，您应该确保 bin 目录为空。到时可能会过去。

我建议您使用两个目标目录：一个用于从 Java 源编译的类，另一个用于 GWT 生成的文件。然后目标war将两者都收集到 WAR 中。