Question

我知道有很多关于此例外的帖子，但我无法解决此问题。必须编辑类路径我想解决它。我试图在hadoop基础设施中运行一个名为DistMap的程序。这是我得到的错误。

Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.util.PlatformName
        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: org.apache.hadoop.util.PlatformName.  Program will exit.
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/fs/FsShell
Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.fs.FsShell
        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: org.apache.hadoop.fs.FsShell.  Program will exit.
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/util/PlatformName
Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.util.PlatformName
        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: org.apache.hadoop.util.PlatformName.  Program will exit.
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/fs/FsShell
Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.fs.FsShell
        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: org.apache.hadoop.fs.FsShell.  Program will exit.
Error could not create input directory /distmap_output_input folder on hdfs file system

哪个java说

/usr/java/jdk1.6.0_32/bin/java

echo $ CLASSPATH给出一个空行

cat~ / .bash_profile说

cat ~/.bash_profile
# .bash_profile

# Get the aliases and functions
if [ -f ~/.bashrc ]; then
        . ~/.bashrc
fi

# User specific environment and startup programs

PATH=$PATH:$HOME/bin

export PATH

更新

$ HADOOP_HOME /usr/lib/hadoop

$ HADOOP_CLASSPATH

/usr/lib/hadoop-0.20-mapreduce/hadoop-ant-2.0.0-mr1-cdh4.4.0.jar:/usr/lib/hadoop‌-0.20-mapreduce/hadoop-ant.jar:/usr/lib/hadoop-0.20-mapreduce/hadoop-examples-2.0‌.0-mr1-cdh4.4.0.jar:/usr/lib/hadoop-0.20-mapreduce/hadoop-examples.jar:/usr/lib/h‌adoop-0.20-mapreduce/hadoop-core.jar:/usr/lib/hadoop-0.20-mapreduce/hadoop-core-2‌.0.0-mr1-cdh4.4.0.jar:/usr/lib/hadoop-0.20-mapreduce/hadoop-test-2.0.0-mr1-cdh4.4‌.0.jar:/usr/lib/hadoop-0.20-mapreduce/hadoop-test.jar:/usr/lib/hadoop-0.20-mapreduce/hadoop-tools-2.0.0-mr1-cdh4.4.0.jar:/usr/lib/hado‌op-0.20-mapreduce/hadoop-tools.jar:/usr/lib/hadoop-0.20-mapreduce/lib/*jar:/usr/lib/hadoop/hadoop-common.jar:/usr/lib/hadoop/hadoop-common-2.0.0-cdh4.4.0.jar

最后2个jar文件包含PlatformName和FsShell类。仍然没有用。

任何人都可以帮我解决这个问题吗？

由于

Answer 1

hadoop2.2.0 应该有 hadoop-auth-2.2.0.jar
为您的版本添加 hadoop auth jar

Answer 2

如果您是maven用户并且遇到此问题 -

    <dependency>
        <groupId>org.apache.hadoop</groupId>
        <artifactId>hadoop-client</artifactId>
        <version>${hadoop.client.version}</version>
    </dependency>
    <dependency>
        <groupId>org.apache.hadoop</groupId>
        <artifactId>hadoop-common</artifactId>
        <version>${hadoop.client.version}</version>
    </dependency>

注意：仅:hadoop-client:2.5.2并未引入所有必需的hadoop依赖项。这就是我添加hadoop-common的原因，它带来了所有必需的代码。

Answer 3

Hadoop HADOOP_CLASSPATH issues

这会有所帮助。

谢谢＆amp;问候，
Alok Thaker

Answer 4

在我的特定情况下，我正在使用Maven，尽管我在POM和类路径中都进行了hadoop-auth，但仍然遇到此异常。

最终为我解决的问题是将POM中的依赖范围从“提供”更改为“编译”。

线程“main”中的异常java.lang.NoClassDefFoundError：org / apache / hadoop / util / PlatformName

4 个答案: