Missing .class file for an interface and junit crashes withNoClassDefFound

[Mark Spezzano]

Hi,

Why does my IDE not generate a .class file for an interface I need to
run junit?

I've looked in the classes folder and lo and behold there is no
corresponding .class file generated for a .java interface file.

I am using Eclipse 3.4 and JDK 1.6_14.

When I run Junit from within the Eclipse IDE everything runs fine.

From the command line, the ant build script complains aobut
NoClassDefFound error, so presumably it's trying to load the .class
file for the interface and can't find it.

How can I get the compiler to generate the .class file?

Cheers,

Mark

 

[John B. Matthews]

Why does my IDE not generate a .class file for an interface I need to
run junit?

I've looked in the classes folder and lo and behold there is no
corresponding .class file generated for a .java interface file.

I am using Eclipse 3.4 and JDK 1.6_14.

When I run Junit from within the Eclipse IDE everything runs fine.

From the command line, the ant build script complains aobut
NoClassDefFound error, so presumably it's trying to load the .class
file for the interface and can't find it.

How can I get the compiler to generate the .class file?

Is this an interface that's part of JUnit?

• org.junit.runner.Describable
• org.junit.runner.manipulation.Filterable
• org.junit.runner.manipulation.Sortable

If so, you need to include JUnit's location in the classpath, as
discussed here:

<http://junit.sourceforge.net/doc/faq/faq.htm>

 

[Mark Spezzano]

No, it's the application's interface file, not from Junit.

Isn't it abnormal for a java file (even interfaces) not to be
compiled?

 

[John B. Matthews]

No, it's the application's interface file, not from Junit.

Perhaps the IDE is has found a matching interface elsewhere, rather than
where you (or the command line) are looking.

Isn't it abnormal for a java file (even interfaces) not to be
compiled?

If the Java source of an interface is compiled, it should produce a
corresponding class file; but there are myriad ways to include the
wrong source or exclude the right one.