Program: 157051
Project: 157051
Buggy source:
/** 
 * TODO Finish JavaDoc This is where the magic happens
 */
public void compute(){
  valuesNeedRegeneration=false;
  final Map<WrappedStack,EnergyValue> stackValueMap=new TreeMap<>();
  uncomputedStacks=new TreeSet<>();
  preCalculationStackValueMap.keySet().stream().filter(wrappedStack -> wrappedStack != null && wrappedStack.getWrappedObject() != null && preCalculationStackValueMap.get(wrappedStack) != null).forEach(wrappedStack -> stackValueMap.put(wrappedStack,preCalculationStackValueMap.get(wrappedStack)));
  stackValueMap.putAll(calculateStackValueMap(stackValueMap));
  postCalculationStackValueMap.keySet().stream().filter(wrappedStack -> wrappedStack != null && wrappedStack.getWrappedObject() != null && postCalculationStackValueMap.get(wrappedStack) != null).forEach(wrappedStack -> stackValueMap.put(wrappedStack,postCalculationStackValueMap.get(wrappedStack)));
  ImmutableSortedMap.Builder<WrappedStack,EnergyValue> stackMappingsBuilder=ImmutableSortedMap.naturalOrder();
  stackMappingsBuilder.putAll(stackValueMap);
  this.stackValueMap=stackMappingsBuilder.build();
  calculateValueStackMap();
  save();
}

Fixed version (ground truth):
/** 
 * TODO Finish JavaDoc This is where the magic happens
 */
public void compute(){
  valuesNeedRegeneration=false;
  final Map<WrappedStack,EnergyValue> stackValueMap=new TreeMap<>();
  uncomputedStacks=new TreeSet<>();
  Map<WrappedStack,EnergyValue> fileValueMap=null;
  try {
    fileValueMap=SerializationHelper.readMapFromFile(preCalculationValuesFile);
  }
 catch (  FileNotFoundException e) {
    LogHelper.warn(ENERGY_VALUE_MARKER,"String_Node_Str",preCalculationValuesFile.getAbsolutePath());
  }
  if (fileValueMap != null) {
    for (    WrappedStack wrappedStack : fileValueMap.keySet()) {
      if (wrappedStack != null && wrappedStack.getWrappedObject() != null && fileValueMap.get(wrappedStack) != null) {
        preCalculationStackValueMap.put(wrappedStack,fileValueMap.get(wrappedStack));
      }
    }
  }
  preCalculationStackValueMap.keySet().stream().filter(wrappedStack -> wrappedStack != null && wrappedStack.getWrappedObject() != null && preCalculationStackValueMap.get(wrappedStack) != null).forEach(wrappedStack -> stackValueMap.put(wrappedStack,preCalculationStackValueMap.get(wrappedStack)));
  stackValueMap.putAll(calculateStackValueMap(stackValueMap));
  fileValueMap=null;
  try {
    fileValueMap=SerializationHelper.readMapFromFile(postCalculationValuesFile);
  }
 catch (  FileNotFoundException e) {
    LogHelper.warn(ENERGY_VALUE_MARKER,"String_Node_Str",postCalculationValuesFile.getAbsolutePath());
  }
  if (fileValueMap != null) {
    for (    WrappedStack wrappedStack : fileValueMap.keySet()) {
      if (wrappedStack != null && wrappedStack.getWrappedObject() != null && fileValueMap.get(wrappedStack) != null) {
        postCalculationStackValueMap.put(wrappedStack,fileValueMap.get(wrappedStack));
      }
    }
  }
  postCalculationStackValueMap.keySet().stream().filter(wrappedStack -> wrappedStack != null && wrappedStack.getWrappedObject() != null && postCalculationStackValueMap.get(wrappedStack) != null).forEach(wrappedStack -> stackValueMap.put(wrappedStack,postCalculationStackValueMap.get(wrappedStack)));
  ImmutableSortedMap.Builder<WrappedStack,EnergyValue> stackMappingsBuilder=ImmutableSortedMap.naturalOrder();
  stackMappingsBuilder.putAll(stackValueMap);
  this.stackValueMap=stackMappingsBuilder.build();
  calculateValueStackMap();
  save();
}