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Editorial Team
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Asked: 2026-06-04T06:11:55+00:00

I am trying to emulate some java.lang and java.io classes, e.g. OutputStream within GWT.

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I am trying to emulate some java.lang and java.io classes, e.g. OutputStream within GWT.

I have created a “super” package in my module and referenced it using super-source.

My package structure looks like

com/example/gwt/client
com/example/gwt/server
com/example/gwt/shared
com/example/gwt/super
com/example/gwt/super/java/io/OutputStream.java
com/example/gwt/mymodule.get.xml

and mymodule.xml contains an entry

<super-source path="super" />

Within Eclipse all of the files within the super folder are in error – to be expected because the package structure is wrong. .class files are being generated in the WEB-INF/classes folder, again with the “wrong” package structure so should be ignored.

When I run my application in development mode I get lots of

unable to resolve class java/lang/Object

errors. What am I doing wrong?

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1 Answer

  1. Editorial Team

    There was nothing wrong with the approach – just the execution.

    I had compile errors in the emulated classes which were being masked by the fact that Eclipse was showing errors because of the “incorrect” package structure. Running the compiler from within Eclipse flushed these out.

    It also seems that deleting the gwt-unitCache might have helped. As I was moving code around it seems that there were stale entries in here that were still being referenced.

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