FULL PRODUCT VERSION :
java version "1.5.0_06"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)
Java HotSpot(TM) Client VM (build 1.5.0_06-b05, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 5.2.3790]

EXTRA RELEVANT SYSTEM CONFIGURATION :
Hyper-threaded Quad (Intel Xeon MP CPU 2.0 Ghz)
4.75 GB of RAM
Windows 2003

A DESCRIPTION OF THE PROBLEM :
When processing text objects in our reports, under load (10+ threads), we have observed occasional NPEs in sun.font.GlyphLayout$EngineRecord.init, line 565.

I took a look at the source for GlyphLayout.java and looks like the NPE may be due to a null _lef.

Here is the source:

        void init(int start, int limit, Font2D font, int script, int lang, int gmask) {
            this.start = start;
            this.limit = limit;
            this.gmask = gmask;
            this.key.init(font, script, lang);
            this.engine = _lef.getEngine(key);
        }

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
You may need a multiprocessor machine to reproduce the NPE. We were running a hyper-threaded quad on Windows 2003 with 4.75 GB of RAM. The test ran 10 threads over 5 iterations.


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
No NPEs.
ACTUAL -
Intermittent NPEs in sun.font.GlyphLayout$EngineRecord.init.


ERROR MESSAGES/STACK TRACES THAT OCCUR :
Here is the stack trace that was generated:

java.lang.NullPointerException
            at sun.font.GlyphLayout$EngineRecord.init(GlyphLayout.java:565)
            at sun.font.GlyphLayout.nextEngineRecord(GlyphLayout.java:439)
            at sun.font.GlyphLayout.layout(GlyphLayout.java:371)
            at sun.font.ExtendedTextSourceLabel.createGV(ExtendedTextSourceLabel.java:267)
            at sun.font.ExtendedTextSourceLabel.getGV(ExtendedTextSourceLabel.java:252)
            at sun.font.ExtendedTextSourceLabel.createCharinfo(ExtendedTextSourceLabel.java:522)
            at sun.font.ExtendedTextSourceLabel.getCharinfo(ExtendedTextSourceLabel.java:451)
            at sun.font.ExtendedTextSourceLabel.getLineBreakIndex(ExtendedTextSourceLabel.java:397)
            at java.awt.font.TextMeasurer.calcLineBreak(TextMeasurer.java:313)
            at java.awt.font.TextMeasurer.getLineBreakIndex(TextMeasurer.java:548)
            at java.awt.font.LineBreakMeasurer.nextOffset(LineBreakMeasurer.java:340)
            at java.awt.font.LineBreakMeasurer.nextLayout(LineBreakMeasurer.java:422)


REPRODUCIBILITY :
This bug can be reproduced occasionally.