[GROOVY-880] NullPointerException at groovy.ui.GroovyMain.run(GroovyMain.java:267)

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.0-JSR-1
• Fix Version/s: 1.0-JSR-2
• Component/s: groovy-jdk
• Environment: All
• Assignee: Unassigned
• Reporter: wangbin
• Created: 13/Jun/05 00:32
• Updated: 14/Jun/05 16:27
• Resolved: 14/Jun/05 16:27

Description

//demo.groovy
println [1,2].collect

{it + 1}

run this file, the output is
Caught: groovy.lang.MissingPropertyException: No such property: println for class: demo
java.lang.NullPointerException
at groovy.ui.GroovyMain.run(GroovyMain.java:267)
at groovy.ui.GroovyMain.process(GroovyMain.java:235)
at groovy.ui.GroovyMain.main(GroovyMain.java:138)
at org.codehaus.groovy.tools.GroovyStarter.main(GroovyStarter.java:92)
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:324)
at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:429)
at org.codehaus.classworlds.Launcher.main(Launcher.java:375)

The first message is caused by defect GROOVY-277, but the NullPointerException is caused by "element.getFileName() can return null", below is the source code.
StackTraceElement[] stackTrace = e.getStackTrace();
for (int i = 0; i < stackTrace.length; i++) {
StackTraceElement element = stackTrace[i];
if (!element.getFileName().endsWith(".java"))

{ System.err.println("\tat " + element); }

}
From the javadoc of StackTraceElement#getFileName()
/**

• Returns the name of the source file containing the execution point
• represented by this stack trace element. Generally, this corresponds
• to the <tt>SourceFile</tt> attribute of the relevant <tt>class</tt>
• file (as per <i>The Java Virtual Machine Specification</i>, Section
• 4.7.7). In some systems, the name may refer to some source code unit
• other than a file, such as an entry in source repository.
  *
• @return the name of the file containing the execution point
• represented by this stack trace element, or <tt>null</tt> if
• this information is unavailable.
  */
  , we can see, getFileName() may return null