我在运行Java程序时遇到问题(它使用了一些第三方JAR)。我可以编译它很好但是当我在ant中调用我的运行目标时它说它找不到我告诉它在类路径中运行的类。这是我的build.xml的样子:
<project basedir="." default="build">
<property name="build" value="build" />
<property name="src" value="." />
<property name="lib" value="lib" />
<path id="classpath">
<fileset dir="${lib}">
<include name="**/*.jar" />
</fileset>
<fileset dir="${build}">
<include name="*.class" />
</fileset>
</path>
<target name="build">
<javac srcdir="${src}" destdir="${build}">
<classpath refid="classpath" />
</javac>
</target>
<target name="run">
<java classname="FirstClass">
<classpath refid="classpath" />
</java>
</target>
有谁知道我可能做错了什么?
这是我从ant获取的堆栈跟踪:
ant run Buildfile: build.xml
run:
[java] Could not find GuiStarter. Make sure you have it in your classpath
[java] at org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:138)
[java] at org.apache.tools.ant.taskdefs.Java.run(Java.java:764)
[java] at org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:218)
[java] at org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:132)
[java] at org.apache.tools.ant.taskdefs.Java.execute(Java.java:105)
[java] at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
[java] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[java] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
[java] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[java] at java.lang.reflect.Method.invoke(Method.java:616)
[java] at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
[java] at org.apache.tools.ant.Task.perform(Task.java:348)
[java] at org.apache.tools.ant.Target.execute(Target.java:357)
[java] at org.apache.tools.ant.Target.performTasks(Target.java:385)
[java] at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337)
[java] at org.apache.tools.ant.Project.executeTarget(Project.java:1306)
[java] at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
[java] at org.apache.tools.ant.Project.executeTargets(Project.java:1189)
[java] at org.apache.tools.ant.Main.runBuild(Main.java:758)
[java] at org.apache.tools.ant.Main.startAnt(Main.java:217)
[java] at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257)
[java] at org.apache.tools.ant.launch.Launcher.main(Launcher.java:104)
[java] Java Result: -1
BUILD SUCCESSFUL Total time: 1 second
答案 0 :(得分:5)
我认为问题在于您的classpath
路径声明。 build
目录应为<pathelement>
<path id="classpath">
<fileset dir="${lib}">
<include name="**/*.jar" />
</fileset>
<pathelement location="${build}" />
</path>
另外,我只会在classpath
refid中加入第三方派对。所以整个块看起来都像。
<path id="3rd-party-classpath">
<fileset dir="${lib}">
<include name="**/*.jar" />
</fileset>
</path>
<target name="build">
<javac srcdir="${src}" destdir="${build}">
<classpath refid="3rd-party-classpath" />
</javac>
</target>
<target name="run">
<java classname="FirstClass">
<classpath>
<pathelement location="${build}" />
<path refid="3rd-party-classpath" />
</classpath>
</java>
</target>
另外,正如DroidIn.net所指出的,你应该为你的程序创建一个包。
答案 1 :(得分:3)
它的方式 - 只有相对于你的路径的lib
目录内的jar才被加载。你有你所有的第三方派对吗?可能有一些运行时库在编译时不需要但在运行时丢失。如果您发布堆栈跟踪,我会告诉您更多信息:)
答案 2 :(得分:0)
试试这个,我就可以上课了。
<property name="src.dir" value="src" />
<property name="build.dir" value="build" />
<property name="classes.dir" value="${build.dir}/classes" />
<property name="jar.dir" value="${build.dir}/jar" />
<property name="main-class" value="sample.Sample" />
<target name="clean">
<delete dir="${classes.dir}" />
</target>
<path id="classpath">
<fileset dir="${jar.dir}">
<include name="*.jar" />
</fileset>
<fileset dir="${classes.dir}">
<include name="/*.class" />
</fileset>
</path>
<target name="compile">
<mkdir dir="${classes.dir}" />
<javac srcdir="${src.dir}" destdir="${classes.dir}">
<classpath refid="classpath" />
</javac>
</target>
<target name="jar" depends="compile">
<mkdir dir="${jar.dir}" />
<jar destfile="${jar.dir}/${ant.project.name}.jar" basedir="${classes.dir}">
<manifest>
<attribute name="Main-Class" value="${main-class}" />
</manifest>
</jar>
</target>
<target name="run" depends="jar">
<java classname="${main-class}">
<classpath refid="classpath" />
</java>
</target>
<target name="clean-build" depends="clean,jar" />
<target name="main" depends="clean,run" />
答案 3 :(得分:0)
我有完全一样的问题。为了避免这种情况,我在Java代码的最顶部删除了“ package”行,这对我有所帮助。此后,我的VS Studio开始抱怨缺少此行,但是xml代码已成功执行))))