`mvn spring-boot:run` 导致了 `java.lang.LinkageError: loader constraint violation` 错误。

huangapple
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英文:

mvn spring-boot:run results in java.lang.LinkageError: loader constraint violation

问题

我有一个项目，将其作为可执行的JAR运行时正常运行。
然而，当我使用 mvn spring-boot:run 时，我遇到以下错误：

  1. 在线程 "Thread-129" 中的异常 java.lang.LinkageError: loader constraint violation: loader (instance of sun/misc/Launcher$AppClassLoader) previously initiated loading for a different type with name "org/test/DefaultIdAndText"
  2. 	at java.lang.ClassLoader.defineClass1(Native Method)
  3. 	...

我无法分享代码，因为它是私有的。
我确实有相同的库JAR依赖项两次（直接1次），并且还有1次通过另一个依赖项。
我尝试过添加排除项，但似乎没有任何作用。

奇怪的是，当我直接运行JAR时，应用程序运行正常。

更新

我还注意到了以下情况... 我认为这就是问题所在：

  1. TomcatEmbeddedWebappClassLoader
  2.   context: ROOT
  3.   delegate: true
  4. -----------> Parent Classloader:
  5. org.springframework.boot.devtools.restart.classloader.RestartClassLoader@79fe98a7

我将尝试禁用开发工具的类加载器和重新加载。

英文:

I have a project that runs fine with I run it as an executable JAR.
However, when I use mvn spring-boot:run I get the following error:

  1.  exception in thread "Thread-129" java.lang.LinkageError: loader constraint violation: loader (instance of sun/misc/Launcher$AppClassLoader) previously initiated loading for a different type with name "org/test/DefaultIdAndText"
  2. 	at java.lang.ClassLoader.defineClass1(Native Method)
  3. 	at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
  4. 	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
  5. 	at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
  6. 	at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
  7. 	at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
  8. 	at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
  9. 	at java.security.AccessController.doPrivileged(Native Method)
  10. 	at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
  11. 	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
  12. 	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
  13. 	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
  14. 	at java.lang.Class.getDeclaredFields0(Native Method)
  15. 	at java.lang.Class.privateGetDeclaredFields(Class.java:2583)
  16. 	at java.lang.Class.getDeclaredFields(Class.java:1916)
  17. 	at com.fasterxml.jackson.databind.util.ClassUtil.getDeclaredFields(ClassUtil.java:1055)
  18. 	at com.fasterxml.jackson.databind.introspect.AnnotatedFieldCollector._findFields(AnnotatedFieldCollector.java:66)
  19. 	at com.fasterxml.jackson.databind.introspect.AnnotatedFieldCollector.collect(AnnotatedFieldCollector.java:41)
  20. 	at com.fasterxml.jackson.databind.introspect.AnnotatedFieldCollector.collectFields(AnnotatedFieldCollector.java:36)
  21. 	at com.fasterxml.jackson.databind.introspect.AnnotatedClass._fields(AnnotatedClass.java:349)
  22. 	at com.fasterxml.jackson.databind.introspect.AnnotatedClass.fields(AnnotatedClass.java:321)
  23. 	at com.fasterxml.jackson.databind.introspect.POJOPropertiesCollector._addFields(POJOPropertiesCollector.java:379)
  24. 	at com.fasterxml.jackson.databind.introspect.POJOPropertiesCollector.collectAll(POJOPropertiesCollector.java:308)
  25. 	at com.fasterxml.jackson.databind.introspect.POJOPropertiesCollector.getJsonValueAccessor(POJOPropertiesCollector.java:196)
  26. 	at com.fasterxml.jackson.databind.introspect.BasicBeanDescription.findJsonValueAccessor(BasicBeanDescription.java:251)
  27. 	at com.fasterxml.jackson.databind.ser.BasicSerializerFactory.findSerializerByAnnotations(BasicSerializerFactory.java:346)
  28. 	at com.fasterxml.jackson.databind.ser.BeanSerializerFactory._createSerializer2(BeanSerializerFactory.java:216)
  29. 	at com.fasterxml.jackson.databind.ser.BeanSerializerFactory.createSerializer(BeanSerializerFactory.java:165)
  30. 	at com.fasterxml.jackson.databind.SerializerProvider._createUntypedSerializer(SerializerProvider.java:1389)
  31. 	at com.fasterxml.jackson.databind.SerializerProvider._createAndCacheUntypedSerializer(SerializerProvider.java:1336)
  32. 	at com.fasterxml.jackson.databind.SerializerProvider.findValueSerializer(SerializerProvider.java:510)
  33. 	at com.fasterxml.jackson.databind.SerializerProvider.findTypedValueSerializer(SerializerProvider.java:713)
  34. 	at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:308)
  35. 	at com.fasterxml.jackson.databind.ObjectMapper._configAndWriteValue(ObjectMapper.java:3905)
  36. 	at com.fasterxml.jackson.databind.ObjectMapper.writeValueAsString(ObjectMapper.java:3219)
  37. 	at lambda$commit$0(EventStoreService.java:120)
  38. 	at java.util.concurrent.ConcurrentHashMap$EntrySpliterator.forEachRemaining(ConcurrentHashMap.java:3606)
  39. 	at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:580)

I can't share the code because it is proprietary.
I do have the same library jar dependency two times (1 directly), and 1 through another dependency.
I added an exclusion but this doesn't seem to do anything.

The strange thing is that the application runs fine, when I run the jar directly.

Update

I also noticed the following... and I think it is the problem:

  1. TomcatEmbeddedWebappClassLoader
  2.   context: ROOT
  3.   delegate: true
  4. ----------> Parent Classloader:
  5. org.springframework.boot.devtools.restart.classloader.RestartClassLoader@79fe98a7

I will try to disable the devtools classloader and reloading.

答案1

得分: 1

问题出在 Spring 开发工具上。
我不得不将它移除，并且还要从任何其他依赖项中排除掉它。

我首先通过运行以下命令并查看其位置来将其移除：

  1. dependency:tree -Dverbose

然后，我要么将依赖项注释掉，要么添加以下排除项：

  1. <exclusion>
  2.     <!-- 在此处声明排除项 -->
  3.     <groupId>org.springframework.boot</groupId>
  4.     <artifactId>spring-boot-devtools</artifactId>
  5. </exclusion>

移除后，错误消失了，现在我看到：

  1. TomcatEmbeddedWebappClassLoader
  2.   context: ROOT
  3.   delegate: true
  4. ----------> Parent Classloader:
  5. java.net.URLClassLoader@44052821
英文:

The problem was spring dev tools.
I had to remove it, and also remove it with an exclusion from any other dependencies.

I removed it by first running the following and seeing where it was located:

  1. dependency:tree -Dverbose

And following I either commented out the dependency or added the following exclusion:

  1. &lt;exclusion&gt;  &lt;!-- declare the exclusion here --&gt;
  2. 					&lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
  3. 					&lt;artifactId&gt;spring-boot-devtools&lt;/artifactId&gt;
  4. 				&lt;/exclusion&gt;

After removing it, the error went away and I now see:

  1. TomcatEmbeddedWebappClassLoader
  2.   context: ROOT
  3.   delegate: true
  4. ----------&gt; Parent Classloader:
  5. java.net.URLClassLoader@44052821

huangapple
  • 本文由 发表于 2020年5月3日 23:20:18
  • 转载请务必保留本文链接：https://java.coder-hub.com/61576871.html
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