SpEL cannot evaluate after update from 6.0.13 to 6.1.1

[piotrooo]

Affects: 6.1.1

---

In version 6.0.13 following repro works:

@Test
void should() throws Exception {
    TestSpel testSpel = new TestSpel();

    DefaultParameterNameDiscoverer parameterNameDiscoverer = new DefaultParameterNameDiscoverer();
    SpelExpression expression = new SpelExpressionParser().parseRaw("#parameter.value()");

    Method method1 = testSpel.getClass().getDeclaredMethod("method1", RecordParameter.class);
    Object[] parameters1 = new Object[]{new RecordParameter("testing record")};
    MethodBasedEvaluationContext context1 = new MethodBasedEvaluationContext(testSpel, method1, parameters1, parameterNameDiscoverer);

    Object value1 = expression.getValue(context1);

    assertThat(value1).isEqualTo("testing record");
}

static class TestSpel {
    void method1(RecordParameter parameter) {
    }
}

record RecordParameter(String value) {
}

After bump to 6.1.1 following exception is thrown:

org.springframework.expression.spel.SpelEvaluationException: EL1011E: Method call: Attempted to call method value() on null context object

	at org.springframework.expression.spel.ast.MethodReference.throwIfNotNullSafe(MethodReference.java:166)
	at org.springframework.expression.spel.ast.MethodReference.getValueRef(MethodReference.java:95)
	at org.springframework.expression.spel.ast.CompoundExpression.getValueRef(CompoundExpression.java:76)
	at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:97)
	at org.springframework.expression.spel.ast.SpelNodeImpl.getValue(SpelNodeImpl.java:114)
	at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:273)

[snicoll]

In version 6.0.13 following repro works:

Make sure that you compile your code with -parameters, see the second paragraph of this section of the upgrade notes. And you should have seen a warning in the logs stating as much with 6.0.x.