centos 6.2不存在javax.mail软件包

Question

I have a centos 6.2 server. I have put the mail.jar into /usr/java/jdk1.7.0_03/jre/lib/ext folder. Then when I compile my java it gives me this error. The funny part I have done this last month on another server also with centos 6.2 and same java version all works fine. What could be missing here?

package javax.mail does not exist
import javax.mail.Message;

Answer 1

Make sure your program is using the java in that jdk you put the mail.jar file in. This type of setup only works if you are using java.exe from the path you put the jar in. It's harder to maintain this because you have to remember to copy that jar if you ever update the jdk. You really just need to make sure mail.jar is in the classpath of the class that needs it. If you jar it up with your program then you just add it to the classpath in your manifest file in the jar. If you do not use a jar, another option is passing it in on the command line.

Ex. java -classpath=c:\\temp\\mail.jar myclass