<svg xmlns="http://www.w3.org/2000/svg" style="display: none">
                    <path stroke-linecap="round" d="M5,0 0,2.5 5,5z" id="raphael-marker-block" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0)"></path>
                </svg>
                <h2><a id="_0"></a></h2> 

2019-10-10 20:33:37.408  INFO 6033 --- [  XNIO-1 task-1] c.l.q.w.rest.errors.ExceptionTranslator  : Exception in controller encountered

'java.util.NoSuchElementException: No value present'


	at java.util.Optional.get(Optional.java:135)
	at com.lenovo.quotation.service.QuoteLineService.modifyGuidanceAndContractEndDateAfterChangeCP(QuoteLineService.java:1280)
	at com.lenovo.quotation.service.QuoteLineService$$FastClassBySpringCGLIB$$d51f02ce.invoke(<generated>)
	at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:749)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
	at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:295)

解决方法

当通过 jpa 通过 id 查询时，使用 findById(id).get()，当id对应的主键ID为空时，会报错如上

当 id 对应的主键 ID 为空时, 如下

classroom（one）-> student（many）

student 表中，classroom_id 为空时会导致报错：java.util.NoSuchElementException: No value present

详细讲解

https://blog.csdn.net/fly_as_tadpole/article/details/84786840