Jason Harrop created FOP-3349:
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Summary: NullPointerException in LineLayoutManager's line breaking
when a line overflows beside a float wider than the measure
Key: FOP-3349
URL: https://issues.apache.org/jira/browse/FOP-3349
Project: FOP
Issue Type: Bug
Components: layout/line
Affects Versions: main, 2.11
Reporter: Jason Harrop
LineLayoutManager.LineBreakingAlgorithm.updateData2 reports a line that does
not fit through curChildLM:
{code:java}
if (curChildLM.getFObj() == null) {
eventProducer.lineOverflows(this, getFObj().getName(), ...);
} else {
eventProducer.lineOverflows(this, curChildLM.getFObj().getName(), ...);
}
{code}
On the float re-layout pass (PageBreaker.handleFloatLayout), curChildLM is
null, so a line that overflows there throws a NullPointerException, and the
document fails, instead of the overflow being reported.
h3. To reproduce
{code:xml}
<fo:block><fo:float float="start"><fo:block-container width="480pt"
height="200pt">
<fo:block> </fo:block></fo:block-container></fo:float></fo:block>
<fo:block><fo:block>block child</fo:block><fo:inline>Overflowing
ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZ</fo:inline></fo:block>
{code}
in a region 425pt wide. It fails on 2.11 and on main.
h3. Fix
Test curChildLM == null as well as getFObj() == null, so the overflow is
reported against the line manager's own FO, as it already is when the child has
no FO. The code only reports; layout does not change. Layout test
float_overflow_relayout.xml fails before with the NullPointerException.
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