Program: 15690
Project: 15690
Buggy source:
/** 
 * @param readOnly makes the instance read-only via {@link WriteProtectable#writeProtect()}; this way it can use the shared introspection cache.
 * @since 2.3.21
 */
protected BeansWrapper(PropertyAssignments pa,boolean readOnly){
  if (pa.getMethodAppearanceFineTuner() == null) {
    Class thisClass=this.getClass();
    boolean overridden=false;
    boolean testFailed=false;
    try {
      while (!overridden && thisClass != DefaultObjectWrapper.class && thisClass != BeansWrapper.class && thisClass != SimpleObjectWrapper.class) {
        try {
          thisClass.getDeclaredMethod("String_Node_Str",new Class[]{Class.class,Method.class,MethodAppearanceDecision.class});
          overridden=true;
        }
 catch (        NoSuchMethodException e) {
          thisClass=thisClass.getSuperclass();
        }
      }
    }
 catch (    Throwable e) {
      LOG.info("String_Node_Str" + thisClass.getName() + "String_Node_Str"+ "String_Node_Str",e);
      overridden=true;
      testFailed=true;
    }
    if (overridden) {
      if (!testFailed && !ftmaDeprecationWarnLogged) {
        LOG.warn("String_Node_Str" + "String_Node_Str");
        ftmaDeprecationWarnLogged=true;
      }
      pa=(PropertyAssignments)pa.clone(false);
      pa.setMethodAppearanceFineTuner(new MethodAppearanceFineTuner(){
        public void process(        MethodAppearanceDecisionInput in,        MethodAppearanceDecision out){
          BeansWrapper.this.finetuneMethodAppearance(in.getContainingClass(),in.getMethod(),out);
        }
      }
);
    }
  }
  this.incompatibleImprovements=pa.getIncompatibleImprovements();
  simpleMapWrapper=pa.isSimpleMapWrapper();
  defaultDateType=pa.getDefaultDateType();
  outerIdentity=pa.getOuterIdentity() != null ? pa.getOuterIdentity() : this;
  strict=pa.isStrict();
  if (!readOnly) {
    sharedInrospectionLock=new Object();
    classIntrospector=new ClassIntrospector(pa.classIntrospectorPropertyAssignments,sharedInrospectionLock);
  }
 else {
    classIntrospector=ClassIntrospector.getInstance(pa.classIntrospectorPropertyAssignments);
    sharedInrospectionLock=classIntrospector.getSharedLock();
  }
  falseModel=new BooleanModel(Boolean.FALSE,this);
  trueModel=new BooleanModel(Boolean.TRUE,this);
  staticModels=new StaticModels(BeansWrapper.this);
  enumModels=createEnumModels(BeansWrapper.this);
  modelCache=new BeansModelCache(BeansWrapper.this);
  setUseCache(pa.useModelCache);
  if (readOnly) {
    writeProtect();
  }
  registerModelFactories();
}

Fixed version (ground truth):
/** 
 * @param readOnly makes the instance read-only via {@link WriteProtectable#writeProtect()}; this way it can use the shared introspection cache.
 * @since 2.3.21
 */
protected BeansWrapper(PropertyAssignments pa,boolean readOnly){
  if (pa.getMethodAppearanceFineTuner() == null) {
    Class thisClass=this.getClass();
    boolean overridden=false;
    boolean testFailed=false;
    try {
      while (!overridden && thisClass != DefaultObjectWrapper.class && thisClass != BeansWrapper.class && thisClass != SimpleObjectWrapper.class) {
        try {
          thisClass.getDeclaredMethod("String_Node_Str",new Class[]{Class.class,Method.class,MethodAppearanceDecision.class});
          overridden=true;
        }
 catch (        NoSuchMethodException e) {
          thisClass=thisClass.getSuperclass();
        }
      }
    }
 catch (    Throwable e) {
      LOG.info("String_Node_Str" + thisClass.getName() + "String_Node_Str"+ "String_Node_Str",e);
      overridden=true;
      testFailed=true;
    }
    if (overridden) {
      if (!testFailed && !ftmaDeprecationWarnLogged) {
        LOG.warn("String_Node_Str" + BeansWrapper.class.getName() + "String_Node_Str"+ "String_Node_Str");
        ftmaDeprecationWarnLogged=true;
      }
      pa=(PropertyAssignments)pa.clone(false);
      pa.setMethodAppearanceFineTuner(new MethodAppearanceFineTuner(){
        public void process(        MethodAppearanceDecisionInput in,        MethodAppearanceDecision out){
          BeansWrapper.this.finetuneMethodAppearance(in.getContainingClass(),in.getMethod(),out);
        }
      }
);
    }
  }
  this.incompatibleImprovements=pa.getIncompatibleImprovements();
  simpleMapWrapper=pa.isSimpleMapWrapper();
  defaultDateType=pa.getDefaultDateType();
  outerIdentity=pa.getOuterIdentity() != null ? pa.getOuterIdentity() : this;
  strict=pa.isStrict();
  if (!readOnly) {
    sharedInrospectionLock=new Object();
    classIntrospector=new ClassIntrospector(pa.classIntrospectorPropertyAssignments,sharedInrospectionLock);
  }
 else {
    classIntrospector=ClassIntrospector.getInstance(pa.classIntrospectorPropertyAssignments);
    sharedInrospectionLock=classIntrospector.getSharedLock();
  }
  falseModel=new BooleanModel(Boolean.FALSE,this);
  trueModel=new BooleanModel(Boolean.TRUE,this);
  staticModels=new StaticModels(BeansWrapper.this);
  enumModels=createEnumModels(BeansWrapper.this);
  modelCache=new BeansModelCache(BeansWrapper.this);
  setUseCache(pa.useModelCache);
  if (readOnly) {
    writeProtect();
  }
  registerModelFactories();
}