TomEE JPA MySql Configuration "An invalid Lifecycle transition was attempted"
I'm new to Java EE, spending some times in learning it. Several hours on this error, cannot find exact similar questions, exept one student on udemy Q&A in same udemy course, but teacher cannot help the student.
The tutorial is teaching persistence using TomEE and JPA on MySQL.
I'm using Eclipse: Eclipse Java EE IDE for Web Developers. Version: 2018-09 (4.9.0)
TomEE Version: Tomcat v9.0 Server
TomEE using JRE: jdk-12.0.1
Project Java Build Path --> Module Path --> Execution Environment: JavaSE-10 (jdk-12.0.1)
Java Compiler: Use compliance from execution environment JavaSE-10
Actual MySql Connector in lib TomEE folder (tried several): mysql-connector-java-8.0.17.jar
This is my tomee.xml
<tomee>
<Resource id="connessioneCorsoWeb" type="DataSource">
JdbcDriver com.mysql.jdbc.Driver
JdbcUrl jdbc:Mysql://127.0.0.1:3306/corso_java_web?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
UserName root
Password admin
</Resource>
</tomee>
this is the persistence.xml
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence" version="1.0">
<persistence-unit name="corsoWebPersistence">
<jta-data-source>connessioneCorsoWeb</jta-data-source>
<properties>
<property name="openejb.jpa.auto-scan" value="true"/>
</properties>
</persistence-unit>
</persistence>
The console message on starting application does not help me
INFO: Undeploying app: D:\Shared\Studio\Java EE Developer - La guida completa\apache-tomee-8.0.0-M3-plume\apache-tomee-plume-8.0.0-M3\webapps\corso-web Aug 16, 2019 12:11:31 PM jdk.internal.reflect.NativeMethodAccessorImpl invoke SEVERE: Error destroying child org.apache.catalina.LifecycleException: An invalid Lifecycle transition was attempted ([before_destroy]) for component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/corso-web]] in state [STARTING_PREP] at org.apache.catalina.util.LifecycleBase.invalidTransition(LifecycleBase.java:430) at org.apache.catalina.util.LifecycleBase.destroy(LifecycleBase.java:316) at org.apache.catalina.core.ContainerBase.removeChild(ContainerBase.java:814) ...
What can I look at to go deeper?
EDIT:
Removing persistence.xml the server starts.
Adding persistence.xml with only lines:
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence" version="1.0">
</persistence>
the server starts.
Just right modifying persistence.xml as this:
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence" version="1.0">
<persistence-unit>
</persistence-unit>
</persistence>
the server fails.
This is a more exhaustive extract from the current console:
... Aug 18, 2019 3:21:18 PM org.apache.tomee.catalina.TomcatWebAppBuilder startInternal SEVERE: Unable to deploy collapsed ear in war StandardEngine[Catalina].StandardHost[localhost].StandardContext[/corso-web] java.lang.NullPointerException at org.apache.openejb.util.LinkResolver.resolve(LinkResolver.java:55) at org.apache.openejb.util.LinkResolver.add(LinkResolver.java:37) at org.apache.openejb.util.LinkResolver.add(LinkResolver.java:33) at org.apache.openejb.config.AutoConfig.resolvePersistenceRefs(AutoConfig.java:223) at org.apache.openejb.config.AutoConfig.deploy(AutoConfig.java:197) at org.apache.openejb.config.ConfigurationFactory$Chain.deploy(ConfigurationFactory.java:420) at org.apache.openejb.config.ConfigurationFactory.configureApplication(ConfigurationFactory.java:1033) at org.apache.tomee.catalina.TomcatWebAppBuilder.startInternal(TomcatWebAppBuilder.java:1286) at org.apache.tomee.catalina.TomcatWebAppBuilder.configureStart(TomcatWebAppBuilder.java:1130) at org.apache.tomee.catalina.GlobalListenerSupport.lifecycleEvent(GlobalListenerSupport.java:134) at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5048) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1377) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1367) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:902) at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:841) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1377) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1367) 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:140) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:902) at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.StandardService.startInternal(StandardService.java:421) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:932) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.startup.Catalina.start(Catalina.java:633) 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:567) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:344) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:475)
Aug 18, 2019 3:21:18 PM jdk.internal.reflect.NativeMethodAccessorImpl invoke SEVERE: Error destroying child org.apache.catalina.LifecycleException: An invalid Lifecycle transition was attempted ([before_destroy]) for component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/corso-web]] in state [STARTING_PREP] at org.apache.catalina.util.LifecycleBase.invalidTransition(LifecycleBase.java:430) at org.apache.catalina.util.LifecycleBase.destroy(LifecycleBase.java:316) at org.apache.catalina.core.ContainerBase.removeChild(ContainerBase.java:814) at org.apache.tomee.catalina.TomcatWebAppBuilder.undeploy(TomcatWebAppBuilder.java:1656) at org.apache.tomee.catalina.TomcatWebAppBuilder.undeploy(TomcatWebAppBuilder.java:1636) at org.apache.tomee.catalina.TomcatWebAppBuilder.startInternal(TomcatWebAppBuilder.java:1317) at org.apache.tomee.catalina.TomcatWebAppBuilder.configureStart(TomcatWebAppBuilder.java:1130) at org.apache.tomee.catalina.GlobalListenerSupport.lifecycleEvent(GlobalListenerSupport.java:134) at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5048) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1377) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1367) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:902) at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:841) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1377) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1367) 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:140) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:902) at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.StandardService.startInternal(StandardService.java:421) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:932) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.startup.Catalina.start(Catalina.java:633) 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:567) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:344) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:475)
Aug 18, 2019 3:21:18 PM jdk.internal.reflect.NativeMethodAccessorImpl invoke SEVERE: A child container failed during start java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/corso-web]] at java.base/java.util.concurrent.FutureTask.report(FutureTask.java:122) at java.base/java.util.concurrent.FutureTask.get(FutureTask.java:191) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:841) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1377) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1367) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:902) at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.StandardService.startInternal(StandardService.java:421) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:932) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.startup.Catalina.start(Catalina.java:633) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:567) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:344) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:475) Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/corso-web]] at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:440) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:198) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1377) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1367) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:902) ... 21 more Caused by: org.apache.tomee.catalina.TomEERuntimeException: java.lang.NullPointerException at org.apache.tomee.catalina.TomcatWebAppBuilder.startInternal(TomcatWebAppBuilder.java:1320) at org.apache.tomee.catalina.TomcatWebAppBuilder.configureStart(TomcatWebAppBuilder.java:1130) at org.apache.tomee.catalina.GlobalListenerSupport.lifecycleEvent(GlobalListenerSupport.java:134) at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5048) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ... 27 more Caused by: java.lang.NullPointerException at org.apache.openejb.util.LinkResolver.resolve(LinkResolver.java:55) at org.apache.openejb.util.LinkResolver.add(LinkResolver.java:37) at org.apache.openejb.util.LinkResolver.add(LinkResolver.java:33) at org.apache.openejb.config.AutoConfig.resolvePersistenceRefs(AutoConfig.java:223) at org.apache.openejb.config.AutoConfig.deploy(AutoConfig.java:197) at org.apache.openejb.config.ConfigurationFactory$Chain.deploy(ConfigurationFactory.java:420) at org.apache.openejb.config.ConfigurationFactory.configureApplication(ConfigurationFactory.java:1033) at org.apache.tomee.catalina.TomcatWebAppBuilder.startInternal(TomcatWebAppBuilder.java:1286) ... 32 more
Aug 18, 2019 3:21:18 PM jdk.internal.reflect.NativeMethodAccessorImpl invoke SEVERE: A child container failed during start java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: A child container failed during start at java.base/java.util.concurrent.FutureTask.report(FutureTask.java:122) at java.base/java.util.concurrent.FutureTask.get(FutureTask.java:191) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.StandardService.startInternal(StandardService.java:421) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:932) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.startup.Catalina.start(Catalina.java:633) 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:567) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:344) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:475) Caused by: org.apache.catalina.LifecycleException: A child container failed during start at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:921) at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:841) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1377) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1367) 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:140) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:902) ... 13 more Caused by: java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/corso-web]] at java.base/java.util.concurrent.FutureTask.report(FutureTask.java:122) at java.base/java.util.concurrent.FutureTask.get(FutureTask.java:191) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) ... 21 more Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/corso-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$StartChild.call(ContainerBase.java:1377) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1367) 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:140) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:902) ... 21 more Caused by: org.apache.tomee.catalina.TomEERuntimeException: java.lang.NullPointerException at org.apache.tomee.catalina.TomcatWebAppBuilder.startInternal(TomcatWebAppBuilder.java:1320) at org.apache.tomee.catalina.TomcatWebAppBuilder.configureStart(TomcatWebAppBuilder.java:1130) at org.apache.tomee.catalina.GlobalListenerSupport.lifecycleEvent(GlobalListenerSupport.java:134) at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5048) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ... 27 more Caused by: java.lang.NullPointerException at org.apache.openejb.util.LinkResolver.resolve(LinkResolver.java:55) at org.apache.openejb.util.LinkResolver.add(LinkResolver.java:37) at org.apache.openejb.util.LinkResolver.add(LinkResolver.java:33) at org.apache.openejb.config.AutoConfig.resolvePersistenceRefs(AutoConfig.java:223) at org.apache.openejb.config.AutoConfig.deploy(AutoConfig.java:197) at org.apache.openejb.config.ConfigurationFactory$Chain.deploy(ConfigurationFactory.java:420) at org.apache.openejb.config.ConfigurationFactory.configureApplication(ConfigurationFactory.java:1033) at org.apache.tomee.catalina.TomcatWebAppBuilder.startInternal(TomcatWebAppBuilder.java:1286) ... 32 more
Aug 18, 2019 3:21:18 PM jdk.internal.reflect.NativeMethodAccessorImpl invoke SEVERE: The required Server component failed to start so Tomcat is unable to start. org.apache.catalina.LifecycleException: A child container failed during start at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:921) at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.StandardService.startInternal(StandardService.java:421) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:932) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.startup.Catalina.start(Catalina.java:633) 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:567) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:344) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:475) Caused by: java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: A child container failed during start at java.base/java.util.concurrent.FutureTask.report(FutureTask.java:122) at java.base/java.util.concurrent.FutureTask.get(FutureTask.java:191) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) ... 13 more Caused by: org.apache.catalina.LifecycleException: A child container failed during start at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:921) at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:841) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1377) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1367) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:902) ... 13 more Caused by: java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/corso-web]] at java.base/java.util.concurrent.FutureTask.report(FutureTask.java:122) at java.base/java.util.concurrent.FutureTask.get(FutureTask.java:191) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) ... 21 more Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/corso-web]] at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:440) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:198) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1377) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1367) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:902) ... 21 more Caused by: org.apache.tomee.catalina.TomEERuntimeException: java.lang.NullPointerException at org.apache.tomee.catalina.TomcatWebAppBuilder.startInternal(TomcatWebAppBuilder.java:1320) at org.apache.tomee.catalina.TomcatWebAppBuilder.configureStart(TomcatWebAppBuilder.java:1130) at org.apache.tomee.catalina.GlobalListenerSupport.lifecycleEvent(GlobalListenerSupport.java:134) at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5048) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ... 27 more Caused by: java.lang.NullPointerException at org.apache.openejb.util.LinkResolver.resolve(LinkResolver.java:55) at org.apache.openejb.util.LinkResolver.add(LinkResolver.java:37) at org.apache.openejb.util.LinkResolver.add(LinkResolver.java:33) at org.apache.openejb.config.AutoConfig.resolvePersistenceRefs(AutoConfig.java:223) at org.apache.openejb.config.AutoConfig.deploy(AutoConfig.java:197) at org.apache.openejb.config.ConfigurationFactory$Chain.deploy(ConfigurationFactory.java:420) at org.apache.openejb.config.ConfigurationFactory.configureApplication(ConfigurationFactory.java:1033) at org.apache.tomee.catalina.TomcatWebAppBuilder.startInternal(TomcatWebAppBuilder.java:1286) ... 32 more
Aug 18, 2019 3:21:18 PM jdk.internal.reflect.DelegatingMethodAccessorImpl invoke INFO: Pausing ProtocolHandler ["http-nio-8080"] Aug 18, 2019 3:21:18 PM jdk.internal.reflect.DelegatingMethodAccessorImpl invoke INFO: Pausing ProtocolHandler ["ajp-nio-8009"] Aug 18, 2019 3:21:18 PM jdk.internal.reflect.DelegatingMethodAccessorImpl invoke INFO: Stopping service [Catalina] Aug 18, 2019 3:21:18 PM org.apache.openejb.server.SimpleServiceManager stop INFO: Stopping server services Aug 18, 2019 3:21:18 PM org.apache.openejb.assembler.classic.Assembler destroyApplication INFO: Undeploying app: D:\Shared\Studio\Java EE Developer - La guida completa\apache-tomee-8.0.0-M3-plume\apache-tomee-plume-8.0.0-M3\webapps\ROOT Aug 18, 2019 3:21:18 PM org.apache.openejb.assembler.classic.Assembler doResourceDestruction INFO: Closing DataSource: connessioneCorsoWeb Aug 18, 2019 3:21:18 PM jdk.internal.reflect.DelegatingMethodAccessorImpl invoke INFO: Destroying ProtocolHandler ["http-nio-8080"] Aug 18, 2019 3:21:18 PM jdk.internal.reflect.DelegatingMethodAccessorImpl invoke INFO: Destroying ProtocolHandler ["ajp-nio-8009"]
Any single idea would be very appreciated.
Finally I solved, to be very clear: in Udemy course was used Tomcat v8.0 Server (apache-tomee-7.0.4) instead I was using Tomcat v9.0 Server (apache-tomee-8.0.0-M3-plume)
Now with old version is not necessary, but with tomee-8.0.0 it is necessary to set JPA in Project Facets (when checking JPA screen alert to configure it), or in JPA project properties.
I've tested both tomee versions, now both working.
This is a screen of my JPA config in my Tomcat v9.0 Server (apache-tomee-8.0.0-M3-plume)
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