Fix win7 install after jdk7, then install JDK8 problem has the value ' 1.8 ', but ' 1.7 ' is required.

http://blog.csdn.net/qiyueqinglian/article/details/46605759

The computer installed the Jdk8,java_home is also set 8.
Do not delete 8 change back to 7.
Changed the Java_home, and the C:\ProgramData\Oracle\Java\javapath in the path value was deleted.
Run Java-version, error
Error:registry key ' Software\javasoft\java Runtime environment ' \CurrentVersion '

Have value ' 1.8 ', but ' 1.7 ' is required.
Error:could not find Java.dll
Error:could not find Java SE Runtime environment.

Solution
1. Open the Start menu, search regedit, open the registry
2. Open "HKEY_LOCAL_MACHINE"
3. Click "Software"
4. Click "JavaSoft"
5. Click "Java Runtime Environment"
6. Select "CurrentVersion" and right click on change to "1.7"
Problem solved.

According to the above modification, cmd input java-version or display version 1.7

Http://www.cnblogs.com/weicleer/p/4273278.html himself Win7 x64 flagship version, at the same time installed JDK7 and JDK8, uninstalled JDK8, cmd command line input: Java-version, Thought to show Java version 1.7, the result was wrong: has the value ' 1.7 ', but ' 1.8 ' is required.

I looked at java_home, environment variables, and found no problem, pointing to C:\Java\jdk1.7.0

Workaround:

Because JDK8 is installed after JDK7 is installed, the three executables for Java.exe, Javaw.exe, and Javaws.exe are automatically copied to the C:\Windows\System32 directory when the JDK1.8 is installed. Because this directory has a higher precedence in Windows environment variables than the environment variables set by Java_home.

Understand this, you know the reason for the error, although uninstalled JDK1.8, but the C:\Windows\System32 directory of Java.exe, Javaw.exe, Javaws.exe three executable files or JDK1.8, so the JDK1.7 java_home\bin under the three corresponding executable file to overwrite the C:\Windows\System32 directory, at this time in the cmd command line input: Java- Version, everything is fine.

I happened to be the opposite of him, so I replaced a few jdk8 files to cover the C:\Windows\System32 directory.

Press the above changes, cmd input java-version display version 1.8

Fix win7 install after jdk7, then install JDK8 problem has the value ' 1.8 ', but ' 1.7 ' is required.