在Window下启动Hadoop-0.21.0版本时，会出现下面这样的错误提示：
1
java.lang.NoClassDefFoundError: org
/
apache
/
hadoop
/
util
/
PlatformName
2
Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.util.PlatformName
3
4
at java.net.URLClassLoader$
1
.run(URLClassLoader.java:
202
)
5
at java.security.AccessController.doPrivileged(Native Method)
6
at java.net.URLClassLoader.findClass(URLClassLoader.java:
190
)
7
at java.lang.ClassLoader.loadClass(ClassLoader.java:
307
)
8
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:
301
)
9
at java.lang.ClassLoader.loadClass(ClassLoader.java:
248
)
10
Could not find the main
class
: org.apache.hadoop.util.PlatformName. Program wil
11
l exit.
经过不断的查找原因和尝试，终于有了解决这个错误的办法，只需要将${HADOOP_HOME}/bin/hadoop-config.sh文件中的第190行的一下的内容
JAVA_PLATFORM
=
`CLASSPATH
=
${CLASSPATH} ${JAVA}
-
Xmx32m ${HADOOP_JAVA_PLATFORM_OPTS}
org.apache.hadoop.util.PlatformName
|
sed
-
e
"
s/ /_/g
"
`
修改成以下的内容即可
JAVA_PLATFORM
=
`CLASSPATH
=
${CLASSPATH} ${JAVA}
-
Xmx32m
-
classpath ${HADOOP_COMMON_HOME}
/
hadoop
-
common
-
0.21
.
0
.jar
org.apache.hadoop.util.PlatformName
|
sed
-
e
"
s/ /_/g
"
`
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