ant gwt 编译器任务失败

问题描述 投票：0回答：4

我按照这个 tutorial 创建 java 编译的 ant 构建文件，然后 GWT 编译，然后执行正确的操作来构建我的 .war 文件。

我使用Eclipse和GWT编译工作，当我运行开发模式时它工作。我在tomcat上也部署成功了

问题是，当我运行脚本时，编译工作正常，但在 gwt-compiler 任务上失败。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>

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构建成功。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 编译器输出指向：
bin/gwt
。编译器还是不行...

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

有人看出这里可能出了什么问题吗？

gwt ant
4个回答
3
投票

我只能说，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
正在寻找该方法的原因。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
类是由编译器使用旧版本加载的）。

尝试彻底查找它们。或者尝试开始一个新的环境，在其中密切关注正在进入的内容。

3
投票

tl;dr：这是由于在类上下文不足或不正确的情况下

Compiler
与
DevMode
提供的链接器存在差异

追踪问题

我注意到您的复制品存在于当前的GWT trunk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;
            }
          }
        };

将堆栈展开到比您的跟踪更远的位置，我们会遍历一个工厂和十层代码，直到我们最终到达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;
...

这是 GWT 预编译阶段调用的 

NoSuchMethodError
的唯一实例。

编译器和 DevMode 链接的差异

酷。现在我们已经深入研究了为什么它会爆炸，让我们弄清楚为什么 

DevMode
有效而 
Compiler
不起作用。我们注意到，两者都导入了相同的 Util.java 副本，因此 从技术上来说 ，这两种类型都可静态地供我们的 Java 编译器使用（只是 GWT 编译器除外）。

检查链接器，我们注意到 

Compiler
直接使用 
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，并用一个单独的通道填充 
StandardLinkerContext
 的实例：

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);
    ...
}

太棒了！那么，该如何解决呢？

正如在撰写本文期间所接受的那样，yair 为该问题提供了一种这样的诊断，指出预编译步骤对于在两个版本的 GWT 上下文中发生冲突的类标识而言并不稳健。 

precompilation.getGeneratedArtifacts();
拉入错误或不足的对象的其他类可见性问题也可能导致此重现。

鉴于 yair 已被接受答案状态，我假设问题现已解决。但对于浏览这篇文章的其他人来说，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出现。

0
投票

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。

0
投票

您派生了一个 JVM 来运行 Gwt 编译器，并且 

bin
目录位于 ClassPath 中。

当 Eclipse 在开发模式下编译时，

bin
中的剩余类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。到时候可能就过去了。

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
会将两者收集到WAR中。

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