Issue
We have a rather complex Spring Boot project and it works fine on Windows during development. However when we run the project on Ubuntu we get a bizzare exception
LOGBACK: No context given for c.q.l.core.rolling.SizeAndTimeBasedRollingPolicy@310623126
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.2.8.RELEASE)
2020-07-08 12:56:42.860 INFO 6 --- [ main] redacted.Application : Starting Application v0.0.1-SNAPSHOT on c72273bf4d02 with PID 6 (/home/plugin/app.jar started by root in /home/plugin)
2020-07-08 12:56:42.867 INFO 6 --- [ main] redacted.Application : The following profiles are active: default
2020-07-08 12:56:44.745 INFO 6 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFAULT mode.
2020-07-08 12:56:45.119 INFO 6 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 345ms. Found 13 JPA repository interfaces.
2020-07-08 12:56:46.089 ERROR 6 --- [ main] o.s.boot.SpringApplication : Application run failed
java.lang.IllegalStateException: Unable to load cache item
at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:79) ~[spring-core-5.2.6.RELEASE.jar!/:5.2.6.RELEASE]
at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34) ~[spring-core-5.2.6.RELEASE.jar!/:5.2.6.RELEASE]
at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:134) ~[spring-core-5.2.6.RELEASE.jar!/:5.2.6.RELEASE]
at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:319) ~[spring-core-5.2.6.RELEASE.jar!/:5.2.6.RELEASE]
at org.springframework.cglib.proxy.Enhancer.createHelper(Enhancer.java:572) ~[spring-core-5.2.6.RELEASE.jar!/:5.2.6.RELEASE]
at org.springframework.cglib.proxy.Enhancer.createClass(Enhancer.java:419) ~[spring-core-5.2.6.RELEASE.jar!/:5.2.6.RELEASE]
at org.springframework.context.annotation.ConfigurationClassEnhancer.createClass(ConfigurationClassEnhancer.java:137) ~[spring-context-5.2.6.RELEASE.jar!/:5.2.6.RELEASE]
at org.springframework.context.annotation.ConfigurationClassEnhancer.enhance(ConfigurationClassEnhancer.java:109) ~[spring-context-5.2.6.RELEASE.jar!/:5.2.6.RELEASE]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses(ConfigurationClassPostProcessor.java:423) ~[spring-context-5.2.6.RELEASE.jar!/:5.2.6.RELEASE]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanFactory(ConfigurationClassPostProcessor.java:257) ~[spring-context-5.2.6.RELEASE.jar!/:5.2.6.RELEASE]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:291) ~[spring-context-5.2.6.RELEASE.jar!/:5.2.6.RELEASE]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:131) ~[spring-context-5.2.6.RELEASE.jar!/:5.2.6.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:706) ~[spring-context-5.2.6.RELEASE.jar!/:5.2.6.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:532) ~[spring-context-5.2.6.RELEASE.jar!/:5.2.6.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.0.RELEASE.jar!/:2.3.0.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) [spring-boot-2.3.0.RELEASE.jar!/:2.3.0.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) [spring-boot-2.3.0.RELEASE.jar!/:2.3.0.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.3.0.RELEASE.jar!/:2.3.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.3.0.RELEASE.jar!/:2.3.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) [spring-boot-2.3.0.RELEASE.jar!/:2.3.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.3.0.RELEASE.jar!/:2.3.0.RELEASE]
at redacted.Application.main(Application.java:61) [classes!/:0.0.1-SNAPSHOT]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_111]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_111]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_111]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_111]
at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49) [redacted-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT]
at org.springframework.boot.loader.Launcher.launch(Launcher.java:109) [redacted-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT]
at org.springframework.boot.loader.Launcher.launch(Launcher.java:58) [redacted-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT]
at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:88) [redacted-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT]
Caused by: java.lang.ExceptionInInitializerError: null
at java.lang.Class.forName0(Native Method) ~[na:1.8.0_111]
at java.lang.Class.forName(Class.java:348) ~[na:1.8.0_111]
at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:571) ~[spring-core-5.2.6.RELEASE.jar!/:5.2.6.RELEASE]
at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:363) ~[spring-core-5.2.6.RELEASE.jar!/:5.2.6.RELEASE]
at org.springframework.cglib.proxy.Enhancer.generate(Enhancer.java:585) ~[spring-core-5.2.6.RELEASE.jar!/:5.2.6.RELEASE]
at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:110) ~[spring-core-5.2.6.RELEASE.jar!/:5.2.6.RELEASE]
at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:108) ~[spring-core-5.2.6.RELEASE.jar!/:5.2.6.RELEASE]
at org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54) ~[spring-core-5.2.6.RELEASE.jar!/:5.2.6.RELEASE]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_111]
at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61) ~[spring-core-5.2.6.RELEASE.jar!/:5.2.6.RELEASE]
... 29 common frames omitted
Caused by: java.lang.IllegalArgumentException: null
at java.util.concurrent.ThreadPoolExecutor.<init>(ThreadPoolExecutor.java:1307) ~[na:1.8.0_111]
at java.util.concurrent.ThreadPoolExecutor.<init>(ThreadPoolExecutor.java:1195) ~[na:1.8.0_111]
at java.util.concurrent.Executors.newFixedThreadPool(Executors.java:89) ~[na:1.8.0_111]
at redacted.Config.<clinit>(Config.java:43) ~[classes!/:0.0.1-SNAPSHOT]
... 39 common frames omitted
On Ubuntu we are using OpenJDK 11. It works on Windows with the same JDK, but it doesn't on Ubuntu. We also tried to run the project in a new Windows Sandbox instance and it worked flawlessly.
Solution
The issue was caused by trying to create a thread pool with 0 threads. We have a development VPS with 1 thread and we had a line of code like this:
public static final Executor EXECUTOR = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors() - 1);
This caused the exception. In hindsight the exception stack trace gave us an obvious clue at the bottom
at redacted.Config.<clinit>(Config.java:43)
It literally pointed to the exact line that faulted.
Another thing you should definitely do is update the apt-cache with sudo apt-get update command install the latest OpenJDK verison.
Answered By - bezbos. Answer Checked By - Mary Flores (WPSolving Volunteer)