java.lang.IllegalAccessError: failed to access class com.mongodb.client.internal.MongoClientDelegate from class com.mongodb.Mongo

[krpremsingh]

I am upgrading the spring boot version from 2.2.7.RELEASE to 2.6.7. In order to upgrade the spring boot i am using spring-data-mongodb version 2.2.12.RELEASE. With this dependency combination my code deployed successfully at my local but when i deploy the code at my SIT server it failed and throws the following error.

	java.lang.IllegalStateException: Error starting child
		at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:729)
		at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:698)
		at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:696)
		at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1024)
		at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1911)
		at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
		at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
		at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
		at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:118)
		at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:825)
		at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:475)
		at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1667)
		at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:315)
		at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)
		at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1162)
		at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1365)
		at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1369)
		at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1347)
		at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
		at java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305)
		at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305)
		at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
		at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
		at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
		at java.base/java.lang.Thread.run(Thread.java:834)
	Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/DOPE-OP-web]]
		at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:440)
		at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:198)
		at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:726)
		... 24 more
	Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mongoFactory' defined in class path resource [eai-app-profile.xml]: Bean instantiation via constructor failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.mongodb.core.SimpleMongoDbFactory]: Constructor threw exception; nested exception is java.lang.IllegalAccessError: failed to access class com.mongodb.client.internal.MongoClientDelegate from class com.mongodb.Mongo (com.mongodb.client.internal.MongoClientDelegate and com.mongodb.Mongo are in unnamed module of loader org.apache.catalina.loader.ParallelWebappClassLoader @2c785774)
		at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:315)
		at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:296)
		at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1372)
		at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1222)
		at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582)
		at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542)
		at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
		at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
		at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
		at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
		at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:953)
		at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918)
		at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583)
		at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145)
		at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:740)
		at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:415)
		at org.springframework.boot.SpringApplication.run(SpringApplication.java:303)
		at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.run(SpringBootServletInitializer.java:175)
		at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.createRootApplicationContext(SpringBootServletInitializer.java:155)
		at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.onStartup(SpringBootServletInitializer.java:97)
		at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:174)
		at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5219)
		at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
		... 25 more
	Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.mongodb.core.SimpleMongoDbFactory]: Constructor threw exception; nested exception is java.lang.IllegalAccessError: failed to access class com.mongodb.client.internal.MongoClientDelegate from class com.mongodb.Mongo (com.mongodb.client.internal.MongoClientDelegate and com.mongodb.Mongo are in unnamed module of loader org.apache.catalina.loader.ParallelWebappClassLoader @2c785774)
		at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:224)
		at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:117)
		at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:311)
		... 47 more
	Caused by: java.lang.IllegalAccessError: failed to access class com.mongodb.client.internal.MongoClientDelegate from class com.mongodb.Mongo (com.mongodb.client.internal.MongoClientDelegate and com.mongodb.Mongo are in unnamed module of loader org.apache.catalina.loader.ParallelWebappClassLoader @2c785774)
		at com.mongodb.Mongo.<init>(Mongo.java:319)
		at com.mongodb.Mongo.<init>(Mongo.java:308)
		at com.mongodb.Mongo.<init>(Mongo.java:304)
		at com.mongodb.MongoClient.<init>(MongoClient.java:326)
		at org.springframework.data.mongodb.core.SimpleMongoDbFactory.<init>(SimpleMongoDbFactory.java:48)
		at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
		at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
		at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
		at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
		at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:211)
		... 49 more

following is the bean config.

    <bean id="mongoClientURI" class="com.web.config.MongoConfig"/>

    <bean id="mongoFactory"
          class="org.springframework.data.mongodb.core.SimpleMongoDbFactory">
        <constructor-arg name="uri" ref="mongoClientURI"/>

    <bean id="mappingContext"
          class="org.springframework.data.mongodb.core.mapping.MongoMappingContext"/>

    <bean id="defaultMongoTypeMapper"
          class="org.springframework.data.mongodb.core.convert.DefaultMongoTypeMapper">
        <constructor-arg name="typeKey">
            <null/>
        </constructor-arg>
    </bean>

    <bean id="mappingMongoConverter"
          class="org.springframework.data.mongodb.core.convert.MappingMongoConverter">
        <constructor-arg name="mongoDbFactory" ref="mongoFactory"/>
        <constructor-arg name="mappingContext" ref="mappingContext"/>
        <property name="typeMapper" ref="defaultMongoTypeMapper"/>
    </bean>

    <bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate" lazy-init="true">
        <constructor-arg name="mongoDbFactory" ref="mongoFactory"/>
        <constructor-arg name="mongoConverter" ref="mappingMongoConverter"/>
    </bean>

Following is the mongoconfig

public class MongoConfig implements FactoryBean<MongoClientURI> {

  private String uri;

  @Value("${mongo_socketTimeout}")
  private int socketTimeout;

  @Value("${mongo_uri}")
  public void setUri(String uri) {
    this.uri = uri;
  }

  @Override
  public MongoClientURI getObject() throws Exception {
    return new MongoClientURI(uri, MongoClientOptions.builder().socketTimeout(socketTimeout));
  }

  @Override
  public Class<?> getObjectType() {
    return MongoClientURI.class;
  }

  @Override
  public boolean isSingleton() {
    return true;
  }
}

Your help will be really appreciated.

[scottfrederick]

It's not clear to me what this problem has to do with Spring Cloud Connectors. Connectors is used when you want connection beans automatically configured based on credentials exposed by a cloud platform, but you are configuring the MongoDB connection explicitly.

i am using spring-data-mongodb version 2.2.12.RELEASE

I would strongly recommend that you use the version of spring-data-mongodb that is managed by Spring Boot. For Spring Boot 2.6.7, this is org.springframework.data:spring-data-mongodb:3.3.4.

[scottfrederick]

Closing due to inactivity. If you can provide a sample that reproduces the problem after addressing the concern in my comment above, we can consider re-opening the issue.