Spring boot 2.1.3.RELEASE An illegal reflective access operation has occurred

Question

I get the following in red lines in my log files with JAVA 11.

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.springframework.util.ReflectionUtils (file:/C:/Users/lol/.m2/repository/org/springframework/spring-core/5.1.5.RELEASE/spring-core-5.1.5.RELEASE.jar) to constructor java.math.BigDecimal(java.math.BigInteger,long,int,int)
WARNING: Please consider reporting this to the maintainers of org.springframework.util.ReflectionUtils
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release

Also i get the following. is this means something wrong with spring-data-redis

      java.lang.UnsupportedOperationException: Reflective setAccessible(true) disabled
        at io.netty.util.internal.ReflectionUtil.trySetAccessible(ReflectionUtil.java:31)
        at io.netty.util.internal.PlatformDependent0$4.run(PlatformDependent0.java:224)
        at java.base/java.security.AccessController.doPrivileged(Native Method)
        at io.netty.util.internal.PlatformDependent0.<clinit>(PlatformDependent0.java:218)
        at io.netty.util.internal.PlatformDependent.isAndroid(PlatformDependent.java:212)
        at io.netty.util.internal.PlatformDependent.<clinit>(PlatformDependent.java:80)
        at io.netty.util.ResourceLeakDetector.<init>(ResourceLeakDetector.java:171)
        at io.netty.util.ResourceLeakDetector.<init>(ResourceLeakDetector.java:213)
        at io.netty.util.ResourceLeakDetectorFactory$DefaultResourceLeakDetectorFactory.newResourceLeakDetector(ResourceLeakDetectorFactory.java:201)
        at io.netty.util.HashedWheelTimer.<clinit>(HashedWheelTimer.java:89)
        at io.lettuce.core.resource.DefaultClientResources.<init>(DefaultClientResources.java:173)
        at io.lettuce.core.resource.DefaultClientResources$Builder.build(DefaultClientResources.java:527)
        at io.lettuce.core.resource.DefaultClientResources.create(DefaultClientResources.java:237)
        at org.springframework.boot.autoconfigure.data.redis.LettuceConnectionConfiguration.lettuceClientResources(LettuceConnectionConfiguration.java:67)
        at org.springframework.boot.autoconfigure.data.redis.LettuceConnectionConfiguration$$EnhancerBySpringCGLIB$$91ef855e.CGLIB$lettuceClientResources$1(<generated>)
        at org.springframework.boot.autoconfigure.data.redis.LettuceConnectionConfiguration$$EnhancerBySpringCGLIB$$91ef855e$$FastClassBySpringCGLIB$$a54e15a.invoke(<generated>)
        at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244)
        at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:363)
        at org.springframework.boot.autoconfigure.data.redis.LettuceConnectionConfiguration$$EnhancerBySpringCGLIB$$91ef855e.lettuceClientResources(<generated>)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:566)
        at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
        at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:622)
        at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:456)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1305)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1144)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
        at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:849)
        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142)
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775)
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:316)

followed there is this exception

2019-04-12 02:24:42.773 DEBUG 27812 --- [           main] i.n.util.internal.PlatformDependent0     : jdk.internal.misc.Unsafe.allocateUninitializedArray(int): unavailable

java.lang.IllegalAccessException: class io.netty.util.internal.PlatformDependent0$6 cannot access class jdk.internal.misc.Unsafe (in module java.base) because module java.base does not export jdk.internal.misc to unnamed module @4f18837a
    at java.base/jdk.internal.reflect.Reflection.newIllegalAccessException(Reflection.java:361)
    at java.base/java.lang.reflect.AccessibleObject.checkAccess(AccessibleObject.java:591)
    at java.base/java.lang.reflect.Method.invoke(Method.java:558)
    at io.netty.util.internal.PlatformDependent0$6.run(PlatformDependent0.java:334)
    at java.base/java.security.AccessController.doPrivileged(Native Method)
    at io.netty.util.internal.PlatformDependent0.<clinit>(PlatformDependent0.java:325)
    at io.netty.util.internal.PlatformDependent.isAndroid(PlatformDependent.java:212)
    at io.netty.util.internal.PlatformDependent.<clinit>(PlatformDependent.java:80)
    at io.netty.util.ResourceLeakDetector.<init>(ResourceLeakDetector.java:171)
    at io.netty.util.ResourceLeakDetector.<init>(ResourceLeakDetector.java:213)
    at io.netty.util.ResourceLeakDetectorFactory$DefaultResourceLeakDetectorFactory.newResourceLeakDetector(ResourceLeakDetectorFactory.java:201)
    at io.netty.util.HashedWheelTimer.<clinit>(HashedWheelTimer.java:89)
    at io.lettuce.core.resource.DefaultClientResources.<init>(DefaultClientResources.java:173)
    at io.lettuce.core.resource.DefaultClientResources$Builder.build(DefaultClientResources.java:527)
    at io.lettuce.core.resource.DefaultClientResources.create(DefaultClientResources.java:237)
    at org.springframework.boot.autoconfigure.data.redis.LettuceConnectionConfiguration.lettuceClientResources(LettuceConnectionConfiguration.java:67)
    at org.springframework.boot.autoconfigure.data.redis.LettuceConnectionConfiguration$$EnhancerBySpringCGLIB$$91ef855e.CGLIB$lettuceClientResources$1(<generated>)
    at org.springframework.boot.autoconfigure.data.redis.LettuceConnectionConfiguration$$EnhancerBySpringCGLIB$$91ef855e$$FastClassBySpringCGLIB$$a54e15a.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244)
    at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:363)
    at org.springframework.boot.autoconfigure.data.redis.LettuceConnectionConfiguration$$EnhancerBySpringCGLIB$$91ef855e.lettuceClientResources(<generated>)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:622)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:456)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1305)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1144)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:849)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:316)

Answer 1

It's a debug message with stacktrace of Netty package.

I found a solution here: https://github.com/netty/netty/issues/7817

You need to change your logger level of this package to suppress these warnings.

Add this line below in your logback-spring.xml to suppress all messages.

<logger name="io.netty.util" level="ERROR"/>