Collectors.toMap中的NullPointerException

susie_小石头

已于 2024-02-02 17:45:10 修改

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分类专栏： java 文章标签： java 后端

于 2024-02-02 17:38:58 首次发布

本文链接：https://blog.youkuaiyun.com/qq_28256783/article/details/135998006

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错误日志如下：

java.lang.NullPointerException: null
	at java.util.HashMap.merge(HashMap.java:1226)
	at java.util.stream.Collectors.lambda$toMap$58(Collectors.java:1320)
	at java.util.stream.ReduceOps$3ReducingSink.accept(ReduceOps.java:169)
	at java.util.Collections$2.tryAdvance(Collections.java:4719)
	at java.util.Collections$2.forEachRemaining(Collections.java:4727)
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
	at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:566)
	at com.xxx.xxx.service.impl.DynamicFormColumnServiceImpl.lambda$getCodePropertyValue$24(DynamicFormColumnServiceImpl.java:465)
	at java.util.stream.Collectors.lambda$toMap$58(Collectors.java:1321)
	at ja