添加 Maven 依赖导致 java.lang.ClassNotFoundException

Question

我有一个应用程序，在我引入以下 Maven 依赖项之前它运行良好。

    <dependency>
        <groupId>joda-time</groupId>
        <artifactId>joda-time</artifactId>
        <version>2.3</version>
    </dependency>

    <dependency>
        <groupId>net.sf.supercsv</groupId>
        <artifactId>super-csv</artifactId>
        <version>2.4.0</version>
    </dependency>
    <dependency>
        <groupId>com.googlecode.json-simple</groupId>
        <artifactId>json-simple</artifactId>
        <version>1.1.1</version>
    </dependency>

    <dependency>
        <groupId>org.codehaus.janino</groupId>
        <artifactId>commons-compiler-jdk</artifactId>
        <version>3.0.0</version>
    </dependency>

引入以下依赖项后，jar 构建正确，没有编译器异常，但是当运行应用程序时，它失败并出现以下异常：

例外情况 1：

Exception in thread "2/streamJsonParser:StreamingJsonParser" java.lang.NoClassDefFoundError: org/apache/log4j/spi/ThrowableInformation
at org.apache.log4j.spi.LoggingEvent.<init>(LoggingEvent.java:165)
at org.apache.log4j.Category.forcedLog(Category.java:391)
at org.apache.log4j.Category.log(Category.java:856)
at org.slf4j.impl.Log4jLoggerAdapter.error(Log4jLoggerAdapter.java:540)
at com.datatorrent.stram.engine.StreamingContainer.run(StreamingContainer.java:1431)
Caused by: java.lang.ClassNotFoundException: org.apache.log4j.spi.ThrowableInformation
at java.net.URLClassLoader.run(URLClassLoader.java:366)
at java.net.URLClassLoader.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
... 5 more

异常 2：

Exception in thread "org.apache.hadoop.hdfs.PeerCache@3826c025" java.lang.NoClassDefFoundError: com/google/common/collect/LinkedListMultimap
at com.google.common.collect.LinkedListMultimap.values(LinkedListMultimap.java:846)
at org.apache.hadoop.hdfs.PeerCache.clear(PeerCache.java:271)
at org.apache.hadoop.hdfs.PeerCache.run(PeerCache.java:128)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException: com.google.common.collect.LinkedListMultimap
at java.net.URLClassLoader.run(URLClassLoader.java:366)
at java.net.URLClassLoader.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)

异常 3：

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/log4j/helpers/NullEnumeration
at org.apache.log4j.Category.getAllAppenders(Category.java:413)
at org.apache.log4j.Category.closeNestedAppenders(Category.java:226)
at org.apache.log4j.Hierarchy.shutdown(Hierarchy.java:467)
at org.apache.log4j.LogManager.shutdown(LogManager.java:267)
at com.datatorrent.stram.engine.StreamingContainer.main(StreamingContainer.java:332)
Caused by: java.lang.ClassNotFoundException: org.apache.log4j.helpers.NullEnumeration
at java.net.URLClassLoader.run(URLClassLoader.java:366)
at java.net.URLClassLoader.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
... 5 morexception in thread "Thread-3" java.lang.NoClassDefFoundError: org/apache/hadoop/util/ShutdownHookManager
at org.apache.hadoop.util.ShutdownHookManager.getShutdownHooksInOrder(ShutdownHookManager.java:124)
at org.apache.hadoop.util.ShutdownHookManager.run(ShutdownHookManager.java:52)
Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.util.ShutdownHookManager
at java.net.URLClassLoader.run(URLClassLoader.java:366)
at java.net.URLClassLoader.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
... 2 more

请让我知道需要做什么。我也尝试添加一些但没有用。请提出建议。

Answer 1

你试过这个吗：

mvn clean install -U

-U 要求 maven 强制更新依赖项。

Answer 2

在您的 POM 中包含以下依赖项

<!-- https://mvnrepository.com/artifact/log4j/apache-log4j-extras -->
<dependency>
    <groupId>log4j</groupId>
    <artifactId>apache-log4j-extras</artifactId>
    <version>1.1</version>
</dependency>

<!-- https://mvnrepository.com/artifact/com.google.guava/guava -->
<dependency>
    <groupId>com.google.guava</groupId>
    <artifactId>guava</artifactId>
    <version>19.0</version>
</dependency>

缺少这些，因此您会遇到异常。

以下是 STS 中 POM 编辑器依赖项选项卡的屏幕截图。最新的eclipse应该也有。

您也可以使用以下命令来检查依赖关系。

mvn dependency:tree

Answer 3

我接受了上面的答案，因为用户向我解释了一种识别添加的重复依赖项的方法。

这实际上是来自 POM 和运行时间环境的重复 hadoop 依赖项的问题。

添加 Maven 依赖导致 java.lang.ClassNotFoundException

adding maven dependency causing java.lang.ClassNotFoundException

java

reflection

json-simple

janino

maven-dependency