静态分析工具Findbugs怎么用?( 二 ) _云知道

迭代器Iterator无法抛出NoSuchElement异常，类实现了java.util.Iterator接口，但是next()方法无法抛出java.util.NoSuchElementException异常，因此，next()方法应该做如此修改，当被调用时，如果没有element返回，则抛出NoSuchElementException异常
4.4 J2EE_STORE_OF_NON_SERIALIZABLE_OBJECT_INTO_SESSION
J2EE: Store of non serializable object into HttpSession (J2EE_STORE_OF_NON_SERIALIZABLE_OBJECT_INTO_SESSION)
This code seems to be storing a non-serializable object into an HttpSession. If this session is passivated or migrated, an error will result.
将没有实现serializable的对象放到HttpSession中，当这个session被钝化和迁移时，将会产生错误，建议放到HttpSession中的对象都实现serializable接口。
4.5 ODR_OPEN_DATABASE_RESOURCE
ODR: Method may fail to close database resource (ODR_OPEN_DATABASE_RESOURCE)
The method creates a database resource (such as a database connection or row set), does not assign it to any fields, pass it to other methods, or return it, and does not appear to close the object on all paths out of the method. Failure to close database resources on all paths out of a method may result in poor performance, and could cause the application to have problems communicating with the database.
方法可能未关闭数据库资源，未关闭数据库资源将会导致性能变差，还可能引起应用与服务器间的通讯问题。
4.6 OS_OPEN_STREAM
OS: Method may fail to close stream (OS_OPEN_STREAM)
The method creates an IO stream object, does not assign it to any fields, pass it to other methods that might close it, or return it, and does not appear to close the stream on all paths out of the method. This may result in a file descriptor leak. It is generally a good idea to use a finally block to ensure that streams are closed.
方法可能未关闭stream，方法产生了一个IO流，却未关闭，将会导致文件描绘符的泄漏，建议使用finally block来确保io stream被关闭。
4.7 DMI_CALLING_NEXT_FROM_HASNEXT
DMI: hasNext method invokes next (DMI_CALLING_NEXT_FROM_HASNEXT)
The hasNext() method invokes the next() method. This is almost certainly wrong, since the hasNext() method is not supposed to change the state of the iterator, and the next method is supposed to change the state of the iterator.
4.8 IL_INFINITE_LOOP
IL: An apparent infinite loop (IL_INFINITE_LOOP)
This loop doesn&＃39;t seem to have a way to terminate (other than by perhaps throwing an exception).
明显的无限循环.
4.9 IL_INFINITE_RECURSIVE_LOOP
IL: An apparent infinite recursive loop (IL_INFINITE_RECURSIVE_LOOP)
This method unconditionally invokes itself. This would seem to indicate an infinite recursive loop that will result in a stack overflow.
明显的无限迭代循环,将导致堆栈溢出.
4.10 WMI_WRONG_MAP_ITERATOR
WMI: Inefficient use of keySet iterator instead of entrySet iterator (WMI_WRONG_MAP_ITERATOR)
This method accesses the value of a Map entry, using a key that was retrieved from a keySet iterator. It is more efficient to use an iterator on the entrySet of the map, to avoid the Map.get(key) lookup.
使用了keySet iterator和Map.get(key)来获取Map值,这种方式效率低,建议使用entrySet的iterator效率更高.
4.11 IM_BAD_CHECK_FOR_ODD
IM: Check for oddness that won&＃39;t work for negative numbers (IM_BAD_CHECK_FOR_ODD)
The code uses x % 2 == 1 to check to see if a value is odd, but this won&＃39;t work for negative numbers (e.g., (-5) % 2 == -1). If this code is intending to check for oddness, consider using x & 1 == 1, or x % 2 != 0.
奇偶检测逻辑,未考虑负数情况.

静态分析工具Findbugs怎么用?( 二 )

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