[GROOVY-11304] The script running reports a null pointer.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.0.18
• Fix Version/s: 3.0.21, 4.0.19, 5.0.0-alpha-6
• Component/s: Static compilation
• Assignee: Eric Milles
• Reporter: cong yang
• Created: 01/Feb/24 02:38
• Updated: 05/Mar/24 01:53
• Resolved: 24/Feb/24 19:28

Description

code:

import groovy.transform.CompileStatic;
import java.util.function.Function;
import java.util.stream.Collectors;
@CompileStatic
class Main {
    static void main(String[] args) {
        List<String> list = ["aaaa", "bbbb", "aaa"];
        Map<String, Integer> map = list.stream().collect(Collectors.toMap(Function.identity(), k -> 1, { a, b -> a + b }));
    }
}

error:

Exception in thread "main" java.lang.NullPointerException
    at com.sun.beans.TypeResolver.resolve(TypeResolver.java:203)
    at com.sun.beans.TypeResolver.resolve(TypeResolver.java:218)
    at com.sun.beans.TypeResolver.resolveInClass(TypeResolver.java:96)
    at java.beans.FeatureDescriptor.getParameterTypes(FeatureDescriptor.java:387)
    at java.beans.MethodDescriptor.setMethod(MethodDescriptor.java:116)
    at java.beans.MethodDescriptor.<init>(MethodDescriptor.java:72)
    at java.beans.MethodDescriptor.<init>(MethodDescriptor.java:56)
    at java.beans.Introspector.getTargetMethodInfo(Introspector.java:1205)
    at java.beans.Introspector.getBeanInfo(Introspector.java:426)
    at java.beans.Introspector.getBeanInfo(Introspector.java:173)
    at groovy.lang.MetaClassImpl.lambda$addProperties$25(MetaClassImpl.java:3466)
    at java.security.AccessController.doPrivileged(Native Method)
    at groovy.lang.MetaClassImpl.doPrivileged(MetaClassImpl.java:3519)
    at groovy.lang.MetaClassImpl.addProperties(MetaClassImpl.java:3466)
    at groovy.lang.MetaClassImpl.reinitialize(MetaClassImpl.java:3448)
    at groovy.lang.MetaClassImpl.initialize(MetaClassImpl.java:3441)
    at org.codehaus.groovy.reflection.ClassInfo.getMetaClassUnderLock(ClassInfo.java:272)
    at org.codehaus.groovy.reflection.ClassInfo.getMetaClass(ClassInfo.java:314)
    at org.codehaus.groovy.runtime.metaclass.MetaClassRegistryImpl.getMetaClass(MetaClassRegistryImpl.java:269)
    at org.codehaus.groovy.runtime.InvokerHelper.getMetaClass(InvokerHelper.java:596)
    at groovy.lang.GroovyObjectSupport.getDefaultMetaClass(GroovyObjectSupport.java:46)
    at groovy.lang.GroovyObjectSupport.<init>(GroovyObjectSupport.java:32)
    at groovy.lang.Closure.<init>(Closure.java:215)
    at Main$_main_lambda1.<init>(Main.groovy)
    at Main.main(Main.groovy:8)