Maven从源代码安装Hadoop，查找tools.jar的错误路径

Question

I am trying to build hadoop-2.4.0-src, using 'mvn clean install'. About half of it completes successfully, but then the HDFS projetc fails with:

Exception in thread "main" java.lang.AssertionError: Missing tools.jar at: /Library/Java/JavaVirtualMachines/jdk1.7.0_55.jdk/Contents/Home/Classes/classes.jar. Expression: file.exists()

....../Home/Classes/ does not exist, and tools.jar is in ......../Home/lib . My $JAVA_HOME environment variable is definitely set correctly, and the JDK listed in the error message is correct - it's just looking in the wrong place within that path. I have seen some postings that a common problem is that people are using the JRE and not the JDK, but I am certain that mine is the JDK.

I have tried both suggestions from the accepted answer here: Buiding Hadoop with Eclipse / Maven - Missing artifact jdk.tools:jdk.tools:jar:1.6

...with no success. Adding the 'dependency' block to Hadoop's pom.xml had no effect, and for the second suggestion I changed the relevant version numbers from 1.6 to 1.7. I have also tried various other suggestions from similar questions without success.

which returns what I expect:

$ which javac
/Library/Java/JavaVirtualMachines/jdk1.7.0_55.jdk/Contents/Home/bin/javac

However, the contents of JavaVM.framework/Versions seems strange to me, as it does not appear to list 1.7:

/System/Library/Frameworks/JavaVM.framework/Versions $ ls -al
total 64
drwxr-xr-x  11 root  wheel  374 May 10 11:05 ./
drwxr-xr-x  12 root  wheel  408 May 10 11:05 ../
lrwxr-xr-x   1 root  wheel   10 May 10 11:05 1.4@ -> CurrentJDK
lrwxr-xr-x   1 root  wheel   10 May 10 11:05 1.4.2@ -> CurrentJDK
lrwxr-xr-x   1 root  wheel   10 May 10 11:05 1.5@ -> CurrentJDK
lrwxr-xr-x   1 root  wheel   10 May 10 11:05 1.5.0@ -> CurrentJDK
lrwxr-xr-x   1 root  wheel   10 May 10 11:05 1.6@ -> CurrentJDK
lrwxr-xr-x   1 root  wheel   10 May 10 11:05 1.6.0@ -> CurrentJDK
drwxr-xr-x   8 root  wheel  272 May 10 11:05 A/
lrwxr-xr-x   1 root  wheel    1 May 10 11:05 Current@ -> A
lrwxr-xr-x   1 root  wheel   59 May 10 11:05 CurrentJDK@ -> /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents

I am relatively new to Java, so I'm having trouble figuring out where the root of the problem is - is it my local directory tree, as shown by the odd contents of Versions ? Is Java not configured correctly (although I have been using Java 1.7 in Eclipse for weeks now with no issues)? Or is it an issue with Hadoop's pom.xml I need to update somehow?

Thanks for any help.

Answer 1

Ran the following to solve the issue on my mac:

cd /Library/Java/JavaVirtualMachines/jdk1.7.0_55.jdk/Contents/Home/ 
sudo mkdir Classes 
cd Classes/ 
sudo ln -s ../jre/lib/rt.jar classes.jar

Ref: http://ilovemylinux.blogspot.com/2013/05/maven-jspc-compile-error-with-java-7-on.html