Eclipse中的Grails

Question

I'm trying to follow some of the introduction to Grails tutorials and am at the point where I want to try to see if I can use a debugger in Eclipse with my Grails applications. My grails application runs fine when I use the command to execute, but when I tried to use the Eclipse run configuration, I get the following error:

Exception in thread "main" java.lang.NullPointerException
at java.io.File.<init>(File.java:194)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
at org.codehaus.groovy.reflection.CachedConstructor.invoke(CachedConstructor.java:77)
at org.codehaus.groovy.runtime.callsite.ConstructorSite$ConstructorSiteNoUnwrapNoCoerce.callConstructor(ConstructorSite.java:107)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallConstructor(CallSiteArray.java:52)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:192)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:200)
at grails.util.GrailsMain.run(GrailsMain.groovy:27)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:86)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:234)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1062)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:893)
at org.codehaus.groovy.runtime.InvokerHelper.invokePogoMethod(InvokerHelper.java:744)
at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:727)
at org.codehaus.groovy.runtime.InvokerHelper.runScript(InvokerHelper.java:383)
at org.codehaus.groovy.runtime.InvokerHelper$runScript.call(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:40)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:117)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:129)
at grails.util.GrailsMain.main(GrailsMain.groovy)

I figure it's a configuration issue (I did recently set the GRAILS_HOME environment variable and that seems to be correct) but that error message doesn't really give me much to go.

Suggestions?

Answer 1

Grails does work in Eclipse. Based on my observations I would actually say that it is the preferred IDE for Grails development (well the STS version).

A) You could choose to install the Eclipse groovy plug in. Can be a little fiddly http://groovy.codehaus.org/Eclipse+Plugin

B) Or you could used the Spring tool suite (STS) IDE and install Grails support from the extensions menu. http://grails.org/STS+Integration (Just works!)

STS is built on Eclipse

I personally have found STS to have better Grails support than Netbeans. Its developed by the same organisation that backs Grails

Answer 2

Have you installed the Groovy Eclipse Plugin?

IIRC, you need this to enable Groovy debugging --- take a look at this page for a step by step about setting up the eclipse debugger - http://www.grails.org/Eclipse+IDE+Integration

But Jared is right, Netbeans step debugger is so much nicer --- http://www.grailsblog.com/archive/show?id=13

Answer 3

除了grails home外，尝试设置JAVA_HOME环境变量。

Answer 4

I was never able to get grails to work properly in eclipse. You may want to try Netbeans though the 6.7 version has improved grails support.

Answer 5

We use Groovy/Grails Tool Suite IDE. It's similar to Spring Tool Suite (STS) in that it's based on Eclipse, but GGTS comes bundled with the Grails distribution itself and the tooling for Eclipse so that there's no extra step required to get any plugins.