Maven Package Compilation Error

Question

i created a webapp project using maven in eclipse. when i run the command mvn package in command prompt it showing folowing error.

[ERROR] COMPILATION ERROR         


        

Answer 1

to set path in below manner

keep jdk's path at first place in path variable, so that other java path will be ignored. compilation error will be resolved.

Answer 2

After creating a second workspace to work in a separate source code branch, I ran into a bizarre situation where I could do a Maven build from the command line in the new workspace, but not in Eclipse. I tried setting the JRE configuration to the JDK as described by others, but still no luck. I finally had to search the entire contents of the new workspace's .metadata directory to find the offending files that refused to be reconfigured. The main culprit was

.plugins/org.eclipse.core.runtime/.settings/org.eclipse.jdt.launching.prefs

It still pointed to the wrong directory despite my configuration change. I did a manual edit to supply the correct JDK name and location. I also edited the files under

.plugins/org.eclipse.debug.core/.launches

These all likewise pointed to the JRE instead of the JDK. Once these edits were made, I could build projects in the second workspace from within Eclipse, not just from the command line.

Answer 3

I'm using maven plugin for Eclipse (V3.3) and was struggling with this error for a while. I finally found the solution which is linked to stale java sources: it has nothing to do with JRE or JDK (I use JRE 1.7).

I found on other forums that it is a known problem in maven-compiler-plugin (same result for V3.3 and 3.5.1).

So, I just recompiled manually the stale source(s) and ran again the goal, this time without any problem.

To figure out stale sources, run the goal with option -X (debug) and look for entries beginning with

[DEBUG] Stale source detected:

indicating a java class file (to be recompiled manually...).

Hope this can be useful as the message given by maven compiler made me search in a wrong direction (play with JRE, JDK, JAVA-HOME, etc).

Answer 4

Go to your 'Runtime Configuration' and configure your JRE to an JDK.

Or as @PawanKumarBaranwal suggested, set your default JDK. But care if you have more than one JRE configured.

Answer 5

In Windows 7 - 64 bit, there is a permissions problem which prevents the installer from unpacking the file C:\Program Files\Java\jdk1.6.xx\lib\tools.jar into your local. This jar file is what maven-compiler-plugin version 3.x uses instead of the usual javac

Solution: Run, as an administrator, the Java JDK installer! And make sure the tools.jar is sitting in the C:\Program Files\Java\jdk1.6.xx\lib\

In case you are using m2e maven integration plugin, you want to see the file is visible to Eclipse via the following steps inside Eclipse:

• Go to Window -> Preferences -> Java -> installed JREs
• Select the JDK you are using (C:\Program Files\Java\jdk1.6.xx)
• Press Edit to see the list of jars including tools.jar, OW you can add it as Add External JAR

Then configure the maven run through these steps:

• Run->Run configurations->Fill in Name, Base directory and Goals.
• Then in the same window move to the JRE tab and point to the JDK \jdk1.6.xx\

Answer 6

Try this. Go to Window --> Preferences --> Java --> Installed JREs.

Double click the JRE, which is inside installed JREs.

Give the JDK path (for example, C:\Program Files\Java\jdk1.7.0_80\) in JRE Home, and give JRE name as JDK. Click on Finish and then OK.

For me it worked.