0

我有一个正在使用的开源 Java 项目。当我直接使用源代码时，一切正常，但是当我尝试从代码中制作一个 jar 并通过 jar 引用相同的类时，我得到ExceptionInInitlaizerError了Unknown Source. 稍后，它显示NoClassDefFoundError. 以下是 4 次测试运行的堆栈跟踪：

用 jar 输出：

java.lang.ExceptionInInitializerError
    at mf.org.apache.xerces.impl.dv.SchemaDVFactory.getInstance(Unknown Source)
    at mf.org.apache.xerces.impl.dv.SchemaDVFactory.getInstance(Unknown Source)
    at mf.org.apache.xerces.impl.xs.XMLSchemaLoader.reset(Unknown Source)
    at mf.org.apache.xerces.impl.xs.XMLSchemaLoader.loadGrammar(Unknown Source)
    at mf.org.apache.xerces.impl.xs.XMLSchemaLoader.loadGrammar(Unknown Source)
    at mf.org.apache.xerces.jaxp.validation.XMLSchemaFactory.newSchema(Unknown Source)
    at mf.javax.xml.validation.SchemaFactory.newSchema(Unknown Source)
    at xml.MFXMLUtil.validate(MFXMLUtil.java:33)
    at xml.MFXMLTester.main(MFXMLTester.java:8)
Caused by: java.lang.RuntimeException: internal error
    at mf.org.apache.xerces.impl.dv.xs.XSSimpleTypeDecl.applyFacets1(Unknown Source)
    at mf.org.apache.xerces.impl.dv.xs.BaseSchemaDVFactory.createBuiltInTypes(Unknown Source)
    at mf.org.apache.xerces.impl.dv.xs.SchemaDVFactoryImpl.createBuiltInTypes(Unknown Source)
    at mf.org.apache.xerces.impl.dv.xs.SchemaDVFactoryImpl.<clinit>(Unknown Source)
    ... 9 more
Test 1: false
java.lang.NoClassDefFoundError: Could not initialize class mf.org.apache.xerces.impl.dv.xs.SchemaDVFactoryImpl
    at mf.org.apache.xerces.impl.dv.SchemaDVFactory.getInstance(Unknown Source)
    at mf.org.apache.xerces.impl.dv.SchemaDVFactory.getInstance(Unknown Source)
    at mf.org.apache.xerces.impl.xs.XMLSchemaLoader.reset(Unknown Source)
    at mf.org.apache.xerces.impl.xs.XMLSchemaLoader.loadGrammar(Unknown Source)
    at mf.org.apache.xerces.impl.xs.XMLSchemaLoader.loadGrammar(Unknown Source)
    at mf.org.apache.xerces.jaxp.validation.XMLSchemaFactory.newSchema(Unknown Source)
    at mf.javax.xml.validation.SchemaFactory.newSchema(Unknown Source)
    at xml.MFXMLUtil.validate(MFXMLUtil.java:33)
    at xml.MFXMLTester.main(MFXMLTester.java:11)
Test 2: false
java.lang.NoClassDefFoundError: Could not initialize class mf.org.apache.xerces.impl.dv.xs.SchemaDVFactoryImpl
    at mf.org.apache.xerces.impl.dv.SchemaDVFactory.getInstance(Unknown Source)
    at mf.org.apache.xerces.impl.dv.SchemaDVFactory.getInstance(Unknown Source)
    at mf.org.apache.xerces.impl.xs.XMLSchemaLoader.reset(Unknown Source)
    at mf.org.apache.xerces.impl.xs.XMLSchemaLoader.loadGrammar(Unknown Source)
    at mf.org.apache.xerces.impl.xs.XMLSchemaLoader.loadGrammar(Unknown Source)
    at mf.org.apache.xerces.jaxp.validation.XMLSchemaFactory.newSchema(Unknown Source)
    at mf.javax.xml.validation.SchemaFactory.newSchema(Unknown Source)
    at xml.MFXMLUtil.validate(MFXMLUtil.java:33)
    at xml.MFXMLTester.main(MFXMLTester.java:14)
Test 3: false
java.lang.NoClassDefFoundError: Could not initialize class mf.org.apache.xerces.impl.dv.xs.SchemaDVFactoryImpl
    at mf.org.apache.xerces.impl.dv.SchemaDVFactory.getInstance(Unknown Source)
    at mf.org.apache.xerces.impl.dv.SchemaDVFactory.getInstance(Unknown Source)
    at mf.org.apache.xerces.impl.xs.XMLSchemaLoader.reset(Unknown Source)
    at mf.org.apache.xerces.impl.xs.XMLSchemaLoader.loadGrammar(Unknown Source)
    at mf.org.apache.xerces.impl.xs.XMLSchemaLoader.loadGrammar(Unknown Source)
    at mf.org.apache.xerces.jaxp.validation.XMLSchemaFactory.newSchema(Unknown Source)
    at mf.javax.xml.validation.SchemaFactory.newSchema(Unknown Source)
    at xml.MFXMLUtil.validate(MFXMLUtil.java:33)
    at xml.MFXMLTester.main(MFXMLTester.java:17)
Test 4: false

如果我将所有源包直接复制到项目中，并运行相同的代码，那么我会得到正确的输出：

Test 1: true
Test 2: true
Test 3: true
Test 4: true

我创建了另一个测试 jar，以确保我的震动过程是正确的并且我能够正确使用它。

任何想法为什么代码可以与源代码一起使用但不能与 jar 一起使用？

EDT：根据要求制作 jar 的 ant 代码

请求有关如何创建 jar 文件的代码。我使用 jarring 的示例 ant 代码来制作 jar，以下是我的 ant 文件：

<project name="Xerces-For-Android" default="dist" basedir=".">
    <description>
        Builds jar for Xerces-For-Android
    </description>
  <!-- set global properties for this build -->
  <property name="src" location="src"/>
  <property name="build" location="build"/>
  <property name="dist"  location="dist"/>

  <target name="init">
    <!-- Create the build directory structure used by compile -->
    <mkdir dir="${build}"/>
  </target>

  <target name="compile" depends="clean, init" description="compile the source " >
    <!-- Compile the java code from ${src} into ${build} -->
    <javac verbose="true" target="1.6" srcdir="${src}" destdir="${build}"/>
  </target>

  <target name="dist" depends="compile"
        description="generate the distribution" >
    <!-- Create the distribution directory -->
    <mkdir dir="${dist}/lib"/>

    <!-- Put everything in ${build} into the .jar file -->
    <jar jarfile="${dist}/lib/Xerces-For-Android.jar" basedir="${build}"/>
  </target>

  <target name="clean"
        description="clean up" >
    <!-- Delete the ${build} and ${dist} directory trees -->
    <delete dir="${build}"/>
    <delete dir="${dist}"/>
  </target>
</project>

EDT：在带有 jar 文件的程序运行中添加了 Verbose，下面是输出的一部分

[Loaded java.lang.Object from shared objects file]
[Loaded java.io.Serializable from shared objects file]
[Loaded java.lang.Comparable from shared objects file]
[Loaded java.lang.CharSequence from shared objects file]
...
[Loaded java.lang.Enum from shared objects file]
[Loaded mf.org.apache.xerces.impl.xpath.regex.Token from file:/C:/path/to/workspace/Sandbox/libs/Xerces-For-Android.jar]
[Loaded mf.org.apache.xerces.impl.xpath.regex.Token$UnionToken from file:/C:/path/to/workspace/Sandbox/libs/Xerces-For-Android.jar]
[Loaded mf.org.apache.xerces.impl.xpath.regex.Token$ParenToken from file:/C:/path/to/workspace/Sandbox/libs/Xerces-For-Android.jar]
[Loaded mf.org.apache.xerces.impl.xpath.regex.Token$ClosureToken from file:/C:/path/to/workspace/Sandbox/libs/Xerces-For-Android.jar]
[Loaded mf.org.apache.xerces.impl.xpath.regex.Token$ConcatToken from file:/C:/path/to/workspace/Sandbox/libs/Xerces-For-Android.jar]
[Loaded mf.org.apache.xerces.impl.xpath.regex.Token$ConditionToken from file:/C:/path/to/workspace/Sandbox/libs/Xerces-For-Android.jar]
[Loaded mf.org.apache.xerces.impl.xpath.regex.Token$ModifierToken from file:/C:/path/to/workspace/Sandbox/libs/Xerces-For-Android.jar]
[Loaded mf.org.apache.xerces.impl.xpath.regex.Token$CharToken from file:/C:/path/to/workspace/Sandbox/libs/Xerces-For-Android.jar]
[Loaded mf.org.apache.xerces.impl.xpath.regex.Token$StringToken from file:/C:/path/to/workspace/Sandbox/libs/Xerces-For-Android.jar]
[Loaded mf.org.apache.xerces.impl.xpath.regex.RangeToken from file:/C:/path/to/workspace/Sandbox/libs/Xerces-For-Android.jar]

[Loaded java.util.ResourceBundle from shared objects file]
[Loaded java.util.ResourceBundle$1 from shared objects file]
[Loaded java.util.ResourceBundle$Control from shared objects file]
[Loaded java.util.Arrays$ArrayList from shared objects file]
[Loaded java.util.Collections$UnmodifiableCollection from shared objects file]
[Loaded java.util.Collections$UnmodifiableList from shared objects file]
[Loaded java.util.Collections$UnmodifiableRandomAccessList from shared objects file]
[Loaded java.util.ResourceBundle$CacheKey from shared objects file]
[Loaded java.util.ResourceBundle$CacheKeyReference from shared objects file]
[Loaded java.util.ResourceBundle$LoaderReference from shared objects file]
[Loaded java.util.ResourceBundle$Control$1 from shared objects file]
[Loaded sun.misc.Launcher$1 from shared objects file]
[Loaded sun.misc.Launcher$2 from shared objects file]
[Loaded java.net.URLClassLoader$2 from shared objects file]
[Loaded java.util.ResourceBundle$BundleReference from shared objects file]
[Loaded java.lang.ExceptionInInitializerError from shared objects file]
java.lang.ExceptionInInitializerError
    at mf.org.apache.xerces.impl.dv.SchemaDVFactory.getInstance(Unknown Source)
    at mf.org.apache.xerces.impl.dv.SchemaDVFactory.getInstance(Unknown Source)
    at mf.org.apache.xerces.impl.xs.XMLSchemaLoader.reset(Unknown Source)
    at mf.org.apache.xerces.impl.xs.XMLSchemaLoader.loadGrammar(Unknown Source)
    at mf.org.apache.xerces.impl.xs.XMLSchemaLoader.loadGrammar(Unknown Source)
    at mf.org.apache.xerces.jaxp.validation.XMLSchemaFactory.newSchema(Unknown Source)
    at mf.javax.xml.validation.SchemaFactory.newSchema(Unknown Source)
    at xml.MFXMLUtil.validate(MFXMLUtil.java:33)
    at xml.MFXMLTester.main(MFXMLTester.java:8)
Caused by: java.lang.RuntimeException: internal error
    at mf.org.apache.xerces.impl.dv.xs.XSSimpleTypeDecl.applyFacets1(Unknown Source)
    at mf.org.apache.xerces.impl.dv.xs.BaseSchemaDVFactory.createBuiltInTypes(Unknown Source)
    at mf.org.apache.xerces.impl.dv.xs.SchemaDVFactoryImpl.createBuiltInTypes(Unknown Source)
    at mf.org.apache.xerces.impl.dv.xs.SchemaDVFactoryImpl.<clinit>(Unknown Source)
    ... 9 more
Test 1: false
java.lang.NoClassDefFoundError: Could not initialize class mf.org.apache.xerces.impl.dv.xs.SchemaDVFactoryImpl
    at mf.org.apache.xerces.impl.dv.SchemaDVFactory.getInstance(Unknown Source)
    at mf.org.apache.xerces.impl.dv.SchemaDVFactory.getInstance(Unknown Source)
    at mf.org.apache.xerces.impl.xs.XMLSchemaLoader.reset(Unknown Source)
    at mf.org.apache.xerces.impl.xs.XMLSchemaLoader.loadGrammar(Unknown Source)
    at mf.org.apache.xerces.impl.xs.XMLSchemaLoader.loadGrammar(Unknown Source)
    at mf.org.apache.xerces.jaxp.validation.XMLSchemaFactory.newSchema(Unknown Source)
    at mf.javax.xml.validation.SchemaFactory.newSchema(Unknown Source)
    at xml.MFXMLUtil.validate(MFXMLUtil.java:33)
    at xml.MFXMLTester.main(MFXMLTester.java:11)
Test 2: false
java.lang.NoClassDefFoundError: Could not initialize class mf.org.apache.xerces.impl.dv.xs.SchemaDVFactoryImpl
    at mf.org.apache.xerces.impl.dv.SchemaDVFactory.getInstance(Unknown Source)
    at mf.org.apache.xerces.impl.dv.SchemaDVFactory.getInstance(Unknown Source)
    at mf.org.apache.xerces.impl.xs.XMLSchemaLoader.reset(Unknown Source)
    at mf.org.apache.xerces.impl.xs.XMLSchemaLoader.loadGrammar(Unknown Source)
    at mf.org.apache.xerces.impl.xs.XMLSchemaLoader.loadGrammar(Unknown Source)
    at mf.org.apache.xerces.jaxp.validation.XMLSchemaFactory.newSchema(Unknown Source)
    at mf.javax.xml.validation.SchemaFactory.newSchema(Unknown Source)
    at xml.MFXMLUtil.validate(MFXMLUtil.java:33)
    at xml.MFXMLTester.main(MFXMLTester.java:14)
Test 3: false
java.lang.NoClassDefFoundError: Could not initialize class mf.org.apache.xerces.impl.dv.xs.SchemaDVFactoryImpl
    at mf.org.apache.xerces.impl.dv.SchemaDVFactory.getInstance(Unknown Source)
    at mf.org.apache.xerces.impl.dv.SchemaDVFactory.getInstance(Unknown Source)
    at mf.org.apache.xerces.impl.xs.XMLSchemaLoader.reset(Unknown Source)
    at mf.org.apache.xerces.impl.xs.XMLSchemaLoader.loadGrammar(Unknown Source)
    at mf.org.apache.xerces.impl.xs.XMLSchemaLoader.loadGrammar(Unknown Source)
    at mf.org.apache.xerces.jaxp.validation.XMLSchemaFactory.newSchema(Unknown Source)
    at mf.javax.xml.validation.SchemaFactory.newSchema(Unknown Source)
    at xml.MFXMLUtil.validate(MFXMLUtil.java:33)
    at xml.MFXMLTester.main(MFXMLTester.java:17)
Test 4: false
[Loaded java.lang.Shutdown from shared objects file]
[Loaded java.lang.Shutdown$Lock from shared objects file]
4

2 回答 2

1

在您的帖子中查看错误：

java.lang.NoClassDefFoundError: Could not initialize class mf.org.apache.xerces.impl.dv.xs.SchemaDVFactoryImpl

听起来您的程序使用了您在创建可执行 jar 时未使用的外部 jar。

您的 jar 没有看到它们，请确保您在类路径中有：

<classpathentry exported="true" kind="lib" path=" ...
                           ^^^

[编辑]

在ANT后面的property部分添加：

    <!-- a classpath for compile this project -->
<path id="build.classpath">
    <fileset dir="${lib.dir}" includes="**/*.jar"/>
</path>

并在属性中添加：

<property name="lib.dir"          value="libs"/>

这是如何将类路径添加到编译部分的示例：

<target name="compile"  depends="copy" description="Compiles java source code" >
    <echo>Start Compiling Code</echo>
    <javac srcdir="${source.dir}" destdir="${build.dir}/${classes.dir}" classpathref="build.classpath" includeantruntime="false"/>
    <echo>End Compiling Code</echo>
</target>

希望对你有帮助，

于 2013-09-18T22:28:23.930 回答
1

我与该项目的作者取得了联系。他们使用eclipse导出jar文件。我注意到 eclipse 导出的 jar 文件和我的 ant jar 文件之间的 jar 大小存在差异。

不太确定我在我的 ant 脚本中缺少什么（甚至尝试过**/*，但没有成功），但是如果有人遇到同样的问题，下面是详细信息。 

File -> Export -> Java / JAR File -> Check "Export all output folders for checked projects"

下面是我用来让 jar 正常工作的设置的屏幕截图：

在此处输入图像描述

于 2013-09-19T15:35:34.017 回答