Referencing static field of class that extends Map in expression language causes class cast exception [SPR-11609]

[spring-projects-issues]

Alexei Osipov opened SPR-11609 and commented

Referencing static field of class that extends Map in expression language causes class cast exception.

Example:

public class A {
    public static final int X = 1;
}

public class B extends HashMap {
    public static final int X = 1;
}

Expression ```
#{T(com.example.A).X}

Expression ```
#{T(com.example.B).X}
``` throws class cast exception:

Caused by: org.springframework.beans.factory.BeanExpressionException: Expression parsing failed; nested exception is java.lang.ClassCastException: java.lang.Class cannot be cast to java.util.Map
at org.springframework.context.expression.StandardBeanExpressionResolver.evaluate(StandardBeanExpressionResolver.java:146)
at org.springframework.beans.factory.support.AbstractBeanFactory.evaluateBeanDefinitionString(AbstractBeanFactory.java:1364)
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.evaluate(BeanDefinitionValueResolver.java:211)
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:183)
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveManagedMap(BeanDefinitionValueResolver.java:375)
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:162)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1456)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1197)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
... 20 more
Caused by: java.lang.ClassCastException: java.lang.Class cannot be cast to java.util.Map
at org.springframework.context.expression.MapAccessor.canRead(MapAccessor.java:38)
at org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty(PropertyOrFieldReference.java:198)
at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:85)
at org.springframework.expression.spel.ast.PropertyOrFieldReference.access$000(PropertyOrFieldReference.java:43)
at org.springframework.expression.spel.ast.PropertyOrFieldReference$AccessorLValue.getValue(PropertyOrFieldReference.java:346)
at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:85)
at org.springframework.expression.spel.ast.SpelNodeImpl.getValue(SpelNodeImpl.java:102)
at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:94)
at org.springframework.context.expression.StandardBeanExpressionResolver.evaluate(StandardBeanExpressionResolver.java:143)
... 28 more

---

Affects: 3.2.8, 4.0.2

Issue Links:

• SpEL: static access via the type function fails if the class implements Map [SPR-9861] #14494 SpEL: static access via the type function fails if the class implements Map ("is duplicated by")

Backported to: 3.2.9