我跟随此tutorial创建我编译的java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，它可以工作。我也成功部署在tomcat上。
事情就是当我运行我的脚本时，编译工作但它在gwt-compiler任务上失败了。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正在成功构建。使用：classname="com.google.gwt.dev.DevMode"代替classname="com.google.gwt.dev.Compiler"。
javac指向bin/src目录，将Google Web Toolkit编译器输出指向：bin/gwt。编译器仍然没有工作......
编辑：我立即从谷歌开发者网站下载了最新的SDK，并覆盖了我的类路径和我的eclipse插件中的旧库。仍然不能使用ant构建脚本。
有人看到这里可能出现什么问题吗？
答案 0 :(得分：3)
我只能说com.google.gwt.dev.jjs.ast.JProgram.serializeTypes(Ljava/util/List;Ljava/io/ObjectOutputStream;)V方法仅在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-dev版本。其中一个是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（编译器使用旧版本加载了JProgram类。）
尝试彻底查找它们。或者尝试开始一个新的环境，在这个环境中你要注意进入的内容。
答案 1 :(得分：3)
tl; dr：这是由于类别上下文不足或不正确的情况下Compiler与DevMode提供的链接器的差异
我注意到您在当前GWT trunk中存在的repro。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;
}
}
};
展开堆栈而不是追踪，我们通过工厂和十层代码反弹，直到我们最终点击UnifyAst.java。而且，瞧瞧：
...
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预编译阶段调用的唯一NoSuchMethodError实例。
冷却。现在我们已经深入研究了为什么会爆炸，让我们弄清楚当DevMode没有时Compiler工作的原因。我们注意到两者都导入Util.java的相同副本，因此技术上，这两种类型都可以静态地提供给我们的Java编译器（而不是GWT编译器）。
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);
DevMode使用更多的terser静态调用，并在StandardLinkerContext的实例中填入单独的传递：
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 provides one such diagnosis for the issue,注意到在两个版本的GWT的上下文中，预编译步骤对于冲突的类标识是不可靠的。 <{1}}引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。
我认为这个问题现在已经解决了，因为yair被给予了接受的答案状态。但是可以想象，其他人在这篇文章中遇到其他类路径或可见性问题可能会导致这个问题再次发生。
答案 2 :(得分：0)
GWT编译器不支持java.io.ObjectOutputStream类 在使用Java类之前必须引用https://developers.google.com/web-toolkit/doc/latest/RefJreEmulation#Package_java_io以确保GWT支持它。
答案 3 :(得分：0)
您分叉JVM以运行Gwt编译器，而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，应确保bin目录为空。它可能会过去。
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将收集到WAR中。