当我使用弹簧加载运行弹簧启动时，它会引发异常，为什么会发生这种情况？答案

【问题标题】：When I run springboot using springloaded, it throws exception，why it happens?当我使用弹簧加载运行弹簧启动时，它会引发异常，为什么会发生这种情况？
【发布时间】：2021-08-02 12:12:09
【问题描述】：

当我使用springloaded运行springboot时，它会抛出异常，为什么会这样？

例外情况如下：

[INFO] --- spring-boot-maven-plugin:1.5.13.RELEASE:run (default-cli) @ start ---
[INFO] Attaching agents: [/Users/jack/.m2/repository/org/springframework/springloaded/1.2.8.RELEASE/springloaded-1.2.8.RELEASE.jar]
java.lang.RuntimeException: Reloading agent exited via exception, please raise a jira
    at org.springsource.loaded.agent.ClassPreProcessorAgentAdapter.transform(ClassPreProcessorAgentAdapter.java:110)
    at sun.instrument.TransformerManager.transform(TransformerManager.java:188)
    at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:428)
    at sun.misc.Unsafe.defineAnonymousClass(Native Method)
    at java.lang.invoke.InnerClassLambdaMetafactory.spinInnerClass(InnerClassLambdaMetafactory.java:326)
    at java.lang.invoke.InnerClassLambdaMetafactory.buildCallSite(InnerClassLambdaMetafactory.java:194)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248)
    at com.springdemo.Application.main(Application.java:27)
Caused by: java.lang.NullPointerException
    at org.springsource.loaded.agent.SpringLoadedPreProcessor.tryToEnsureSystemClassesInitialized(SpringLoadedPreProcessor.java:373)
    at org.springsource.loaded.agent.SpringLoadedPreProcessor.preProcess(SpringLoadedPreProcessor.java:135)
    at org.springsource.loaded.agent.ClassPreProcessorAgentAdapter.transform(ClassPreProcessorAgentAdapter.java:107)

【问题讨论】：

标签： java spring spring-boot spring-test springrunner

【解决方案1】：

我的springboot版本是：2.1.3.RELEASE，我尝试将spring-boot-maven-plugin版本从1.5.13.RELEASE更新到2.4.4.RELEASE，然后解决了。好像是版本不兼容的问题。

<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>1.5.13.RELEASE</version>

update to

<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>2.4.4.RELEASE</version>

【讨论】：