SPEL: Unable to pass null values to method calls [SPR-5899]

[spring-projects-issues]

Oliver Becker opened SPR-5899 and commented

This is a follow-up of #10332

The bugfix treats all null values as of type java.lang.Object (line 90 in org.springframework.expression.spel.ast.MethodReference). Unfortunately Spring can't find a matching method in this case, because generally Object can't be converted to any other type.

Simple example:

public class NullMethodParamConverterBug {

public Integer tryToInvokeWithNull(Integer value) {
    return value;
}

}

and

#{nullMethodParamConverterBug.tryToInvokeWithNull(null)}

causes

org.springframework.expression.spel.SpelException: EL1003E:(pos 28): Method call: Method tryToInvokeWithNull(java.lang.Object) cannot be found on NullMethodParamConverterBug type
at org.springframework.expression.spel.ast.MethodReference.findAccessorForMethod(MethodReference.java:130)
at org.springframework.expression.spel.ast.MethodReference.getValueInternal(MethodReference.java:76)
at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:54)
at org.springframework.expression.spel.ast.SpelNodeImpl.getValue(SpelNodeImpl.java:51)
at org.springframework.expression.spel.SpelExpression.getValue(SpelExpression.java:66)

---

Affects: 3.0 M3

Referenced from: commits eb69e75

[spring-projects-issues]

Andy Clement commented

Test and fix committed, supports passing null to methods or constructors and allows for varargs.