Java Jar hell运行时异常

Question

运行单元测试时，我遇到了jar hell的问题。

java.lang.RuntimeException: found jar hell in test classpath
    at org.elasticsearch.bootstrap.BootstrapForTesting.<clinit>(BootstrapForTesting.java:95)
    at org.elasticsearch.test.ESTestCase.<clinit>(ESTestCase.java:99)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:348)
    at com.carrotsearch.randomizedtesting.RandomizedRunner$2.run(RandomizedRunner.java:585)
Caused by: java.lang.IllegalStateException: jar hell!
class: org.apache.commons.io.CopyUtils
jar1: C:\Users\vvenkatasubbu\.gradle\caches\modules-2\files-2.1\commons-io\commons-io\1.3.2\b6dde38349ba9bb5e6ea6320531eae969985dae5\commons-io-1.3.2.jar
jar2: C:\Users\vvenkatasubbu\.gradle\caches\modules-2\files-2.1\org.apache.commons\commons-io\1.3.2\b6dde38349ba9bb5e6ea6320531eae969985dae5\commons-io-1.3.2.jar
    at org.elasticsearch.bootstrap.JarHell.checkClass(JarHell.java:282)
    at org.elasticsearch.bootstrap.JarHell.checkJarHell(JarHell.java:186)
    at org.elasticsearch.bootstrap.JarHell.checkJarHell(JarHell.java:87)
    at org.elasticsearch.bootstrap.BootstrapForTesting.<clinit>(BootstrapForTesting.java:93)
    ... 4 more

我遇到了上述错误，并通过删除了不必要的jar文件解决了这些错误。

但是我面临以下两个jar的问题，即tomcat-embed-core-8.0.36.jar和hibernate-
jpa-2.1-api-1.0.0.Final.jar。这两者之间有一个共同的类，我需要两个jar文件，任何人都可以向我解释如何解决此问题。我都需要jar文件。

    java.lang.RuntimeException: found jar hell in test classpath
            at org.elasticsearch.bootstrap.BootstrapForTesting.<clinit>(BootstrapForTesting.java:95)
            at org.elasticsearch.test.ESTestCase.<clinit>(ESTestCase.java:99)
            at java.lang.Class.forName0(Native Method)
            at java.lang.Class.forName(Class.java:348)
            at com.carrotsearch.randomizedtesting.RandomizedRunner$2.run(RandomizedRunner.java:585)
        Caused by: java.lang.IllegalStateException: jar hell!
        class: javax.persistence.PersistenceProperty
        jar1: C:\Users\vvenkatasubbu\.gradle\caches\modules-2\files-2.1\org.apache.tomcat.embed\tomcat-embed-core\8.0.36\de87fa65671daad59773c8280eeabbd335f42c\tomcat-embed-core-8.0.36.jar
        jar2: C:\Users\vvenkatasubbu\.gradle\caches\modules-2\files-2.1\org.hibernate.javax.persistence\hibernate-jpa-2.1-api\1.0.0.Final\5e731d961297e5a07290bfaf3db1fbc8bbbf405a\hibernate-jpa-2.1-api-1.0.0.Final.jar
            at org.elasticsearch.bootstrap.JarHell.checkClass(JarHell.java:282)
            at org.elasticsearch.bootstrap.JarHell.checkJarHell(JarHell.java:186)
            at org.elasticsearch.bootstrap.JarHell.checkJarHell(JarHell.java:87)
            at org.elasticsearch.bootstrap.BootstrapForTesting.<clinit>(BootstrapForTesting.java:93)
            ... 4 more

提前致谢。

Answer 1

我通过重写单元测试sorce文件夹中的JarHell类来解决此问题。

我已经完成的步骤

1. 在测试文件夹中创建一个单独的程序包。

org.elasticsearch.bootstrap

1. 创建一个新类并粘贴以下代码。

    package org.elasticsearch.bootstrap;

    import java.net.URL;

    public class JarHell {
        private JarHell() {}
        public static void checkJarHell() throws Exception {}
        public static void checkJarHell(URL urls[]) throws Exception {}
        public static void checkVersionFormat(String targetVersion) {}
        public static void checkJavaVersion(String resource, String targetVersion) {}
        public static URL[] parseClassPath() {return new URL[]{};}
    }

1. 做gradlew构建时，问题已得到解决。

2. 要单独运行集成测试，请将以下行添加到运行配置中的VM参数。

   -ea -Dtests.security.manager=false