用CLASSPATH环境变量替换classpath参数

Question

Requirements:

• Command-line only, ie no IDE's
• Do not want to use classpath argument
• OS: OS X v10.6.8

Steps:

• Setup CLASSPATH environment variable: export CLASSPATH="/path-jar-files-are-at/*"
• Compile my java app: javac MyApp.java
• Launch my java app: java MyApp

After launching, the following error appears:

Exception in thread "main" java.lang.NoClassDefFoundError: MyApp
Caused by: java.lang.ClassNotFoundException: MyApp

Using classpath argument doesn't have this problem

• Compile my java app: javac -classpath /path-jar-files-are-at/* MyApp.java
• Launch my java app: java -classpath /path-jar-files-are-at/* MyApp

Any ideas?

Answer 1

The CLASSPATH should not contain the trailing "/*" - that is not going to give you a valid classpath. The shell is expanding the /* and separating the list with whitespace/newlines - rather than the ":" character.

If you still really want it to work this (dynamic) way, try something like this:

export CP=`ls /path-jar-files-are-at/*`; CP=`echo $CP | sed 's/\.jar\s/.jar:/g'`; CP="$CP:/path-jar-files-are-at"