无法通过 ant 命令 JAVA_HOME 定位 tools.jar 并且为 jdk 设置了 PATH 而不是 jre

Question

I am using windows 7 java installed in Program files and Program Files (x86). I am getting such error "Unable to locate tools.jar. Expected to find it in C:\\Program Files\\Java\\jre7\\lib\\tools.jar

I have set path variable to `C:\Program Files\Java\jdk1.7.0_51;`
 JAVA_HOME `C:\Program Files\Java\jdk1.7.0_51;`

But I tried ant -diagnostics command get java.home is C:\\Programe Files\\Java\\jre7\\

Answer 1

If you have installed Java Development Kit (JDK) you can find this Jar at the place.

I seems you have installed only Java Runtime Environment (JRE)

So if tools.jar is not there at the path C:\\Program Files\\Java\\jre7\\lib\\ , try placing it manually at the path.It should solve your problem.

Answer 2

I had the same issue.

echo %JAVA_HOME% :

C:\\Program Files\\Java\\jdk1.8.0_51

But ant -diagnostics indicated:

java.home : C:\\Program Files\\Java\\jre1.8.0_60

The problem is the JAVA_HOME environment variable is pointing to an invalid directory.

In your case, C:\\Program Files\\Java\\jdk1.7.0_51 does not exist, so Ant goes looking for the folder itself and I guess pulls the JRE folder first.

The problem is that C:\\Program Files\\Java\\jdk1.7.0_51 does not exist, and so ANT resets the java.home variable to first Java directory that it finds:

C:\\Programe Files\\Java\\jre7\\

In my case, I had both of these and it still did not find the correct one:

C:\\Program Files\\Java\\jdk1.8.0_60

C:\\Program Files\\Java\\jre1.8.0_60

You probably had updated to a more recently version of the JDK, like

C:\\Program Files\\Java\\jdk1.7.0_79