Fatal error compiling: tools.jar not found:

Question

When compiling a project in Eclipse, I get below error:

Fatal error compiling: tools.jar not found:

How is this caused and how can I solve it?

Solution 1

Goto Windows -> Preferences

Java -> Installed JREs –> Execution Environment

JavaSE1.x -> JDE 1.x

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If you don’t have the JDK in the Installed JRE, then

Select the Installed JRE and Add the JDK installed path

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Let's try to configure your run configurations to clean install

Click on the small black arrow and then Run Configurations

After, you just put clean install in your Maven goal, like this :

And then, try to run your compilation, and we will see what happens... :)

Solution 2

You need to put the right Java Build path for your project.

In Eclipse:

--> Right click the project name - Properties (keyboard shortcut: [Alt] + [Enter] )
--> Libraries
--> Change the JRE7 to JDK7.

And I think the problem will be solved that way ;)

Comments

[khmarbaise]

Di you try to run the build on command line?

[Uppi]

yes..its working fine in command line.

[MikeJRamsey56]

One more place to check is the JRE tab on the Maven Build Run Configuration window.

[Manish Kumar]

Even i faced this issue. It was a eclipse config problem related to JRE. sudotutorials.com/java/870/…

[Uppi]

Dont see a libraries section when hit alt+enter!!!

[Valentin Montmirail]

Ok, so : right-click on your project, and then, properties

[Uppi]

I found the java build path Valentin, but It shows all the project jar files. I did change the path to JDk in the preferences->java->installed jre->jdk...But its not helping

[Uppi]

Yes I DId. Now it shoes this error.Posted in the Question

[Uppi]

All the build runs fine in the command prompt, But not sure exactly the problem with eclipse.

[Valentin Montmirail]

OK you should configure your run configurations if the problem change to this :) Your maven goal should be something like : clean install

[Uppi]

I was showing a bunch of errors yesterday.An internal error occurred during: "Loading descriptor for xxx.". org.eclipse.emf.ecore.xmi.FeatureNotFoundException: Feature 'taglib' not found. (platform:/resource/xxx/src/main/webapp/WEB-INF/web.xml, 226, 11). This was one of the errors yesterday

[Uppi]

This was an other one..Could not get the value for parameter encoding for plugin execution default-resources Plugin org.apache.maven.plugins:maven-resources-plugin:2.5 or one of its dependencies could not be resolved: Failed to collect dependencies for org.apache.maven.plugins:maven-resources-plugin:jar:2.5 (

[Uppi]

HTTP Status 404 - /xxx/ and also has a unhandled event loop exception->plugin> org.eclipse.ui in the error log... :|

[Valentin Montmirail]

O.o OK maybe you have a proxy or something, and your maven don't succeed to download packages... :/ maven.apache.org/guides/mini/guide-proxies.html

[Uppi]

I dont have a settings.xml file under my repository!!!

[JavaTec]

I had to create a JAVA_HOME variable within eclipse (go to preferences -> java -> build path -> class path variable) and point this to JDK7 - it started to work

[JGFMK]

@JavaTec Better to add Windows -> Preferences....