Cygwin中Java的不同版本

Question

Today I installed cygwin and I was checking my JAVA HOME and other settings and I found out very strange thing..

When I do, echo $JAVA_HOME , I always get C:\\Java\\jdk1.6.0_26 which is fine and that's what I have already set to jdk1.6.0_26 in my environment variables as well but when I do java -version, I always get different version of java, I always see 1.7..

uname@D-PHC-22334455 /cygdrive/c
$ echo $JAVA_HOME
C:\Java\jdk1.6.0_26

uname@D-PHC-22334455 /cygdrive/c
$ which java
/cygdrive/c/WINDOWS/system32/java

uname@D-PHC-22334455 /cygdrive/c
$ java -version
java version "1.7.0_25"
Java(TM) SE Runtime Environment (build 1.7.0_25-b17)
Java HotSpot(TM) Client VM (build 23.25-b01, mixed mode)

I have already checked my PATH variables and JAVA_HOME as well.. Both are pointing to jdk1.6 Can anybody explain what wrong has happened?

Below is my PATH variable-

uname@D-PHC-22334455 /cygdrive/c
$ echo $PATH
/usr/local/bin:/usr/bin:/cygdrive/c/Java/jdk1.6.0_26:/cygdrive/c/Program Files (x86)/DataStax Community/python:/cygdrive/c/Users/uname/openssl/bin:/cygdrive/c/Python27:/cygdrive/c/Python27/Scripts:/cygdrive/d/app/uname/product/11.1.0/db_1/bin:/cygdrive/c/apache-maven-3.0.4-bin/apache-maven-3.0.4/bin:/cygdrive/c/Program Files (x86)/IBM/RationalSDLC/Clearquest/cqcli/bin:/cygdrive/c/Perl64/bin:/cygdrive/c/WINDOWS/system32:/cygdrive/c/WINDOWS:/cygdrive/c/WINDOWS/System32/Wbem:/cygdrive/c/WINDOWS/System32/WindowsPowerShell/v1.0:/cygdrive/c/Perl64/bin:/cygdrive/c/Program Files (x86)/Perforce:/cygdrive/c/Program Files (x86)/IBM/RationalSDLC/ClearCase/bin:/cygdrive/c/Program Files (x86)/IBM/RationalSDLC/common:/cygdrive/d/ede-5.1.1/apache-ant-1.7.1.2008.06.27/bin:/cygdrive/c/Program Files (x86)/Git/cmd:/usr/bin:/cygdrive/c/Program Files/Common Files/Hitachi ID:/cygdrive/c/Eclipse-C++/MinGW:/etc/alternatives:%APPDATA%/Python/Scripts

Answer 1

So the Java installed must be Java 1.7.0_25 as it says in

uname@D-PHC-22334455 /cygdrive/c
$ which java
/cygdrive/c/WINDOWS/system32/java

even though your PATH points to C:\\Java\\jdk1.6.0_26 .

/Windows/system32 is always searched first.

Answer 2

为什么不尝试将Java文件/cygdrive/c/WINDOWS/system32/java重命名为/cygdrive/c/WINDOWS/system32/java.back然后再次添加（如果仍然无法使用）java路径路径：
export JAVA_HOME="/cygdrive/c/Java/jdk1.6.0_26"
export PATH="$PATH:$JAVA_HOME/bin"