我有以下项目目录结构:
MyProject/
src/main/java/
All of my Java sources
build/
build.xml
build.properties
ivy.xml
ivy-settings.xml
ivy-settings.properties
build.xml
看起来像这样:
<project name="MyProject" default="audit" basedir=".." xmlns:ivy="antlib:org.apache.ivy.ant">
<property file="build/build.properties"/>
<property environment="env"/>
<path id="ant.lib.path">
<fileset dir="${env.ANT_HOME}/lib" includes="*.jar"/>
</path>
<taskdef resource="org/apache/ivy/ant/antlib.xml" uri="antlib:org.apache.ivy.ant" classpathref="ant.lib.path"/>
<target name="configIvy">
<echo message="Configuring Ivy."/>
<echo message="URL is: ${ivy.settings.home}"/>
<ivy:settings url="${ivy.settings.home}"/>
<!-- Clear/flush the Ivy cache. -->
<echo message="Cleaning the local Ivy cache for the current build."/>
<ivy:cleancache/>
</target>
</project>
当我运行时ant -buildfile /<path-to-my-project>/MyProject/build/build.xml configIvy
,我得到以下控制台输出:
Buildfile: /<path-to-my-project>/MyProject/build/build.xml
configIvy:
[echo] Configuring Ivy.
[echo] URL is: file:////<path-to-my-project>/MyProject/build/ivy-settings.xml
[ivy:cleancache] :: Apache Ivy 2.3.0-rc1 - 20120416000235 :: http://ant.apache.org/ivy/ ::
BUILD FAILED
/<path-to-my-project>/MyProject/build/build.xml:85: java.lang.ExceptionInInitializerError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at org.apache.ivy.util.url.URLHandlerRegistry.getHttp(URLHandlerRegistry.java:47)
at org.apache.ivy.ant.IvyAntSettings.configureURLHandler(IvyAntSettings.java:367)
at org.apache.ivy.ant.IvyAntSettings.createIvyEngine(IvyAntSettings.java:267)
at org.apache.ivy.ant.IvyAntSettings.getConfiguredIvyInstance(IvyAntSettings.java:237)
at org.apache.ivy.ant.IvyTask.getIvyInstance(IvyTask.java:92)
at org.apache.ivy.ant.IvyTask.prepareTask(IvyTask.java:256)
at org.apache.ivy.ant.IvyTask.execute(IvyTask.java:276)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
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:392)
at org.apache.tools.ant.Target.performTasks(Target.java:413)
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:811)
at org.apache.tools.ant.Main.startAnt(Main.java:217)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:280)
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:109)
Caused by: java.lang.NullPointerException
at org.apache.log4j.Category.isDebugEnabled(Category.java:129)
at org.apache.commons.logging.impl.Log4JLogger.isDebugEnabled(Log4JLogger.java:239)
at org.apache.commons.httpclient.HttpClient.<clinit>(HttpClient.java:69)
... 25 more
我的文件指定了托管在我的本地计算机 ( )ivy-settings.xml
上的 Artifactory 存储库的 URL 解析器。http://localhost:8080/artifactory/myrepo
我想知道 Ivy 是否在后台使用 HttpClient(正如堆栈跟踪所暗示的那样),并且由于某种原因,因为它是同一台机器上的 HTTP URL 而令人窒息?也许?!?是的,我确信 URL 是正确的,并且在我运行 Ant 构建时 Artifactory 正在运行!
谁能发现这里发生了什么?为什么会<ivy-cleancache>
抛出NPE?我正在查看它的源代码,但似乎无法找到 NPE 的来源或原因。如果需要,我可以提供更多细节。提前致谢!