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Cannot infer type arguments for TreeMap<> in 4.39 RC2

bugSomething isn't workingSomething isn't working

compilerEclipse Java Compiler (ecj) related issuesEclipse Java Compiler (ecj) related issues

regressionSomething was broken by a previous changeSomething was broken by a previous change

Status: Open.

#4885 In eclipse-jdt/eclipse.jdt.core;

· tiller opened on Mar 2, 2026

Regression: Eclipse compiler fails to infer the correct type

Status: Open.

#4893 In eclipse-jdt/eclipse.jdt.core;

· niks opened on Mar 3, 2026

Align inference resolution with javac by applying hints from Maurizio

javacecj not compatible with javacecj not compatible with javac

Status: Open (in progress).

eclipse-jdt/eclipse.jdt.corenumber 5004

#5004 In eclipse-jdt/eclipse.jdt.core;

· stephan-herrmann opened on Apr 16, 2026