EL1072 when evaluating compiled expression using method SpelExpression.getValue(Object rootObject, Class<T> expectedResultType) [SPR-17229]

[spring-projects-issues]

Juan Domínguez González opened SPR-17229 and commented

When using method SpelExpression.getValue(Object rootObject, Class<T> expectedResultType) for evaluating an expression involving a simple boolean comparison it fails when using the bytecode compiled expression.

The trace shows a NPE in Operator.equalityCheck, accesing the evaluation context for a typeComparator:

org.springframework.expression.spel.ast.Operator.equalityCheck(Operator.java:222)

spel.Ex2141.getValue(Unknown Source)

org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:209)

The problem, apparently resides in method SpelExpression.getValue(Object, Class<T>). In line 209, it calls method getValue(Object, EvaluationContext) on its compiledAst but passes null instead of an evaluation context.

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Affects: 4.3.16

Referenced from: commits 51cee65, e332e32, 1a626ab

Backported to: 4.3.19

[spring-projects-issues]

Juergen Hoeller commented

I've revised SpelExpression to consistently expose a default EvaluationContext to the compiled AST. Also, Operator includes explicit support for Boolean comparisons now.