ImageWriter.endWriteSequence() is supposed to throw an IllegalStateException when output is not set for the writer. But currently this method throws the following NullPointerException:
java.lang.NullPointerException
at com.sun.imageio.plugins.gif.GIFImageWriter.writeTrailer(GIFImageWriter.java:1187)
at com.sun.imageio.plugins.gif.GIFImageWriter.endWriteSequence(GIFImageWriter.java:327)
at WriterTest.createBufferedImage(WriterTest.java:88)
at WriterTest.<init>(WriterTest.java:27)
at WriterTest.main(WriterTest.java:100)

This is reproducible on all platforms with the current 2D PIT build dated May'23rd.

I have attached a sample test. Execute the sample test. If you see the above NPE on the console, the bug is reproduced.

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