为什么我的jarsigner无法工作？

Question

For some reason why I try any command including just jarsigner it gives me the following error:

Error: Could not find or load main class sun.security.tools.JarSigner

Do I have an incorrect version of Java? I've re-installed Java many times and tried 64 bit and 32 bit versions. I have the newest version of the Java JDK ( Java 7 update 45 ) on Windows 7. Also, my javac command gives me a similar error:

Error: Could not find or load main class com.sun.tools.javac.Main

But, my java command doesn't.

My PATH includes the java jdk bin C:\\Program Files\\Java\\jdk1.7.0_45\\bin , Do I need anything else? My CLASSPATH is .;C:\\Program Files (x86)\\Java\\jre7\\lib\\ext\\QTJava.zip and I tried changing it to just . but that didn't work either. I also tried setting the variable to Path instead of PATH but the same error came out. I have searched many times in my PATH environment variable and there are no signs of the word Java . The bin above for my PATH is the only sign of the word Java . Right now I have my Java bin in my user environment variables. Do I need it in the system environment variables?

Thanks.

Answer 1

Your PATH is wrong, or it contains a bin directory from an obsolete or largely uninstalled JDK, or your CLASSPATH points to an obsolete JDK, or possibly a JRE. If either of the latter, remove that element from the PATH or CLASSPATH.

What do I actually need for the CLASSPATH if I need anything.

There's no need for a CLASSPATH setting other than '.' as far as Java itself is concerned.