当我使用 ant 构建我使用 libgdx 的项目时，我收到一个奇怪的错误。它表示未找到类 com.google.gwt.dom.client.ImageElement，但代码中根本没有使用它。我怎样才能找到让这门课变得必要的原因？即使搜索整个项目也不会给出任何结果。它说错误在 PixmapTextureAtlas.java:16 ( class source )，但没有使用该 ImageElement 类的代码。添加包含 com.google.gwt.dom.client.ImageElement 类的库当然有帮助，但我想弄清楚为什么需要这个类。
这是 ant 日志中告诉实际错误的地方:
Compiling 3 source files to /home/suseika/Projects/tendiwa/client/bin
/home/suseika/Projects/tendiwa/client/src/org/tendiwa/client/PixmapTextureAtlas.java:16: error: cannot access ImageElement
class file for com.google.gwt.dom.client.ImageElement not found
这是整个 Ant 日志:
/usr/lib/jvm/java-7-oracle/bin/java -Xmx128m -Xss2m -Dant.home=/opt/intellijidea/lib/ant -Dant.library.dir=/opt/intellijidea/lib/ant/lib -Dfile.encoding=UTF-8 -classpath /opt/intellijidea/lib/ant/lib/ant-apache-regexp.jar:/opt/intellijidea/lib/ant/lib/ant-swing.jar:/opt/intellijidea/lib/ant/lib/ant-apache-xalan2.jar:/opt/intellijidea/lib/ant/lib/ant-jdepend.jar:/opt/intellijidea/lib/ant/lib/ant-apache-resolver.jar:/opt/intellijidea/lib/ant/lib/ant-jsch.jar:/opt/intellijidea/lib/ant/lib/ant.jar:/opt/intellijidea/lib/ant/lib/ant-testutil.jar:/opt/intellijidea/lib/ant/lib/ant-launcher.jar:/opt/intellijidea/lib/ant/lib/ant-apache-bsf.jar:/opt/intellijidea/lib/ant/lib/ant-commons-logging.jar:/opt/intellijidea/lib/ant/lib/ant-netrexx.jar:/opt/intellijidea/lib/ant/lib/ant-junit.jar:/opt/intellijidea/lib/ant/lib/ant-commons-net.jar:/opt/intellijidea/lib/ant/lib/ant-apache-bcel.jar:/opt/intellijidea/lib/ant/lib/ant-antlr.jar:/opt/intellijidea/lib/ant/lib/ant-apache-log4j.jar:/opt/intellijidea/lib/ant/lib/ant-jai.jar:/opt/intellijidea/lib/ant/lib/ant-apache-oro.jar:/opt/intellijidea/lib/ant/lib/ant-jmf.jar:/opt/intellijidea/lib/ant/lib/ant-javamail.jar:/usr/lib/jvm/java-7-oracle/lib/tools.jar:/opt/intellijidea/lib/idea_rt.jar com.intellij.rt.ant.execution.AntMain2 -logger com.intellij.rt.ant.execution.IdeaAntLogger2 -inputhandler com.intellij.rt.ant.execution.IdeaInputHandler -buildfile /home/suseika/Projects/tendiwa/client/build.xml jar
build.xml
property
path
description
compile
ant
property
property
property
description
compile
mkdir
javac
jar
ant
property
description
_core_src_available
available
ontology
antcall
property
description
_core_src_available
available
_build_core
ant
property
property
compile
echo
/home/suseika/Projects/tendiwa/client
mkdir
javac
jar
jar
Building jar: /home/suseika/Projects/tendiwa/MainModule.jar
description
tempfile
mkdir
Created dir: /tmp/tendiwa373148820
unjar
Expanding: /home/suseika/Projects/tendiwa/MainModule.jar into /tmp/tendiwa373148820
Expanding: /home/suseika/Projects/tendiwa/tendiwa-backend.jar into /tmp/tendiwa373148820
Expanding: /home/suseika/Projects/tendiwa/tendiwa-ontology.jar into /tmp/tendiwa373148820
copy
Copying 1 file to /tmp/tendiwa373148820
java
Created item short_sword
Created item short_bow
Created item bucket
Created item boot
Created item steel_morningstar
Created item rifle_ammo
Created item handAxe
Created item iron_armor
Created item steel_mace
Created item jacket
Created item fedora
Created item wooden_arrow
Saving sources to /tmp/tendiwa373148820/ontology/src
tendiwa/resources/SoundTypes.java
tendiwa/resources/CharacterTypes.java
tendiwa/resources/ObjectTypes.java
tendiwa/resources/FloorTypes.java
tendiwa/resources/ItemTypes.java
tendiwa/resources/MaterialTypes.java
mkdir
mkdir
mkdir
Created dir: /tmp/tendiwa373148820/ontology/bin
javac
jar
Building jar: /home/suseika/Projects/tendiwa/tendiwa-ontology.jar
echo
Resources source code generated
ant
property
property
compile
echo
/home/suseika/Projects/tendiwa/client
mkdir
javac
jar
jar
jar
Building jar: /home/suseika/Projects/tendiwa/MainModule.jar
mkdir
javac
/home/suseika/Projects/tendiwa/client/build.xml:25: Compile failed; see the compiler error output for details.
at org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:1150)
at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:912)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:390)
at org.apache.tools.ant.Target.performTasks(Target.java:411)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1399)
at org.apache.tools.ant.Project.executeTarget(Project.java:1368)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1251)
at org.apache.tools.ant.Main.runBuild(Main.java:809)
at org.apache.tools.ant.Main.startAnt(Main.java:217)
at org.apache.tools.ant.Main.start(Main.java:180)
at org.apache.tools.ant.Main.main(Main.java:268)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.intellij.rt.ant.execution.AntMain2.main(AntMain2.java:30)
/home/suseika/Projects/tendiwa/client/build.xml (25:46)'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds
Compiling 3 source files to /home/suseika/Projects/tendiwa/client/bin
/home/suseika/Projects/tendiwa/client/src/org/tendiwa/client/PixmapTextureAtlas.java:16: error: cannot access ImageElement
class file for com.google.gwt.dom.client.ImageElement not found
1 error
/home/suseika/Projects/tendiwa/client/build.xml:25: Compile failed; see the compiler error output for details.
at org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:1150)
at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:912)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:390)
at org.apache.tools.ant.Target.performTasks(Target.java:411)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1399)
at org.apache.tools.ant.Project.executeTarget(Project.java:1368)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1251)
at org.apache.tools.ant.Main.runBuild(Main.java:809)
at org.apache.tools.ant.Main.startAnt(Main.java:217)
at org.apache.tools.ant.Main.start(Main.java:180)
at org.apache.tools.ant.Main.main(Main.java:268)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.intellij.rt.ant.execution.AntMain2.main(AntMain2.java:30)
/home/suseika/Projects/tendiwa/client/build.xml:25: Compile failed; see the compiler error output for details.
at org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:1150)
at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:912)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:390)
at org.apache.tools.ant.Target.performTasks(Target.java:411)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1399)
at org.apache.tools.ant.Project.executeTarget(Project.java:1368)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1251)
at org.apache.tools.ant.Main.runBuild(Main.java:809)
at org.apache.tools.ant.Main.startAnt(Main.java:217)
at org.apache.tools.ant.Main.start(Main.java:180)
at org.apache.tools.ant.Main.main(Main.java:268)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.intellij.rt.ant.execution.AntMain2.main(AntMain2.java:30)
Ant build completed with 3 errors one warning in 4s at 10/30/13 3:09 AM
这是出现此错误的 ant 文件的一部分:
<path id="tendiwa.jars">
<fileset dir="../libs">
<include name="**/*.jar"/>
</fileset>
<pathelement path="../tendiwa-backend.jar"/>
<pathelement path="../tendiwa-ontology.jar"/>
<!--<fileset dir="/usr/share/java" includes="gwt*.jar"/>-->
</path>
<target name="compile">
<ant dir="../MainModule" target="jar"/>
<mkdir dir="bin"/>
<javac destdir="bin" failonerror="true">
<classpath>
<path refid="tendiwa.jars"/>
<!--temporary-->
<pathelement path="../tendiwa-ontology.jar"/>
<!--temporary-->
<pathelement path="../MainModule.jar"/>
<fileset dir="../libs" includes="**/*.jar"/>
</classpath>
<src>
<pathelement path="Desktop/src"/>
<pathelement path="src"/>
</src>
</javac>
</target>
最佳答案
给定的库可能具有它不提供的依赖项，因此您的代码间接需要它。 PixmapTextureAtlas.java:16 确实引用了这个类，并且您使用了 PixmapTextureAtlas，因此您间接需要 com.google.gwt.dom.client.ImageElement.
像 Maven 这样的工具可以添加依赖项/子依赖项并轻松管理它们。
关于java - 项目编译需要一个没有在任何地方使用的类，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/19669351/