线上某任务出现报警，报错日志如下：
java.lang.NullPointerException: null
at java.util.HashMap.merge(HashMap.java:1225)
at java.util.stream.Collectors.lambda$toMap$58(Collectors.java:1320)
at java.util.stream.ReduceOps$3ReducingSink.accept(ReduceOps.java:169)
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1380)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
at com.xxx.web.controller.TaskController.getOmsAccidCloudCCUserIdMap(TaskController.java:648)
at com.xxx.web.controller.TaskController.executePushNewRegisterLead(TaskController.java:400)
at com.xxx.web.controller.TaskController.pushNewRegister(TaskController.java:145)
对应出错的代码：
omsAccidCloudCCUserIdMap = administratorList.stream()
.collect(Collectors.toMap(Administrator::getAccid,administrator
-> cloudccAccidUserIdMap.get(administrator.getCloudccAccid())));
已知administratorList不含有null元素，administratorList、cloudccAccidUserIdMap都不为null，Administrator::getAccid也不会返回null值。
综上所述，NPE只可能发生在
administrator -> cloudccAccidUserIdMap.get(administrator.getCloudccAccid())
但是HashMap是允许一个null key和多个null value的啊，查看openjdk的HashMap源码，看到javadoc也是如此说明的：
Hash table based implementation of the Map interface. This implementation provides all of the optional map operations, and permits null values and the null key. (The HashMap class is roughly equivalent to Hashtable, except that it is unsynchronized and permits nulls.) This class makes no guarantees as to the order of the map; in particular, it does not guarantee that the order will remain constant over time.
那究竟是哪里出了问题呢，回过头仔细看报错信息，发现是java.util.HashMap.merge(HashMap.java:1225)抛出的异常，查看merge源码：
@Override
public V merge(K key, V value,
BiFunction<? super V, ? super V, ? extends V> remappingFunction) {
if (value == null)
throw new NullPointerException();
if (remappingFunction == null)
throw new NullPointerException();
...
return value;
}
向上追溯，看到java.util.Map接口中对merge的定义：
/**
* If the specified key is not already associated with a value or is
* associated with null, associates it with the given non-null value.
* Otherwise, replaces the associated value with the results of the given
* remapping function, or removes if the result is {@code null}. This
* method may be of use when combining multiple mapped values for a key.
* For example, to either create or append a {@code String msg} to a
* value mapping:
*
* <pre> {@code
* map.merge(key, msg, String::concat)
* }</pre>
*
* <p>If the function returns {@code null} the mapping is removed. If the
* function itself throws an (unchecked) exception, the exception is
* rethrown, and the current mapping is left unchanged.
*
* @implSpec
* The default implementation is equivalent to performing the following
* steps for this {@code map}, then returning the current value or
* {@code null} if absent:
*
* <pre> {@code
* V oldValue = map.get(key);
* V newValue = (oldValue == null) ? value :
* remappingFunction.apply(oldValue, value);
* if (newValue == null)
* map.remove(key);
* else
* map.put(key, newValue);
* }</pre>
*
* <p>The default implementation makes no guarantees about synchronization
* or atomicity properties of this method. Any implementation providing
* atomicity guarantees must override this method and document its
* concurrency properties. In particular, all implementations of
* subinterface {@link java.util.concurrent.ConcurrentMap} must document
* whether the function is applied once atomically only if the value is not
* present.
*
* @param key key with which the resulting value is to be associated
* @param value the non-null value to be merged with the existing value
* associated with the key or, if no existing value or a null value
* is associated with the key, to be associated with the key
* @param remappingFunction the function to recompute a value if present
* @return the new value associated with the specified key, or null if no
* value is associated with the key
* @throws UnsupportedOperationException if the {@code put} operation
* is not supported by this map
* (<a href="http://t.zoukankan.com/{@docRoot}/java/util/Collection.html#optional-restrictions">optional</a>)
* @throws ClassCastException if the class of the specified key or value
* prevents it from being stored in this map
* (<a href="http://t.zoukankan.com/{@docRoot}/java/util/Collection.html#optional-restrictions">optional</a>)
* @throws NullPointerException if the specified key is null and this map
* does not support null keys or the value or remappingFunction is
* null
* @since 1.8
*/
default V merge(K key, V value,
BiFunction<? super V, ? super V, ? extends V> remappingFunction) {
Objects.requireNonNull(remappingFunction);
Objects.requireNonNull(value);
V oldValue = get(key);
V newValue = (oldValue == null) ? value :
remappingFunction.apply(oldValue, value);
if(newValue == null) {
remove(key);
} else {
put(key, newValue);
}
return newValue;
}
可以看到，Collectors.toMap在底层使用的是Map::merge方法，而merge方法不允许null value，无论该Map实例是否支持null value(但是允许null key如果Map实例支持的话)。
问题解决@throws NullPointerException if the specified key is null and this map does not support null keys or the value or remappingFunction is null
找到原因了，那么如何解决呢？这个问题在stackoverflow上也有一篇帖子说明了如何fix这个问题https://stackoverflow.com/questions/24630963/java-8-nullpointerexception-in-collectors-tomap。
不使用Collectors.toMap，改为使用forEach遍历列表手动转换。