Thank you for your reply, Noel.

On Friday, December 23, 2016 at 7:19:08 AM UTC+1, Noel Grandin wrote:
>
> there seem to be some chunks missing from the stack trace which makes it a 
> little tricky to see why things are going wrong. 
>
>
Here is the whole thing:

2016-12-23 00:46:03 jdbc[3]: 

/**/PreparedStatement prep8 = conn3.prepareStatement("select 
aufgabenliste_seq.nextval");

2016-12-23 00:46:03 jdbc[3]: Plan       : calculate cost for plan 
[SYSTEM_RANGE:0:org.h2.table.RangeTable@603d6c40]

2016-12-23 00:46:03 jdbc[3]: Plan       :   for table filter 
SYSTEM_RANGE:0:org.h2.table.RangeTable@603d6c40

2016-12-23 00:46:03 jdbc[3]: Table      :     potential plan item cost 1 
index PUBLIC.RANGE_INDEX

2016-12-23 00:46:03 jdbc[3]: Plan       :   best plan item cost 1 index 
PUBLIC.RANGE_INDEX

2016-12-23 00:46:03 jdbc[3]: Plan       : plan cost 2

2016-12-23 00:46:03 jdbc[3]: 

/**/ResultSet rs9 = prep8.executeQuery();

2016-12-23 00:46:03 lock: 1 exclusive write lock requesting for SYS

2016-12-23 00:46:03 lock: 1 exclusive write lock added for SYS

2016-12-23 00:46:03 lock: 1 exclusive write lock unlock SYS

2016-12-23 00:46:03 lock: 1 exclusive write lock requesting for SYS

2016-12-23 00:46:03 lock: 1 exclusive write lock added for SYS

2016-12-23 00:46:03 jdbc[3]: exception

org.h2.jdbc.JdbcSQLException: Allgemeiner Fehler: "
java.lang.RuntimeException: Unexpected code path"

General error: "java.lang.RuntimeException: Unexpected code path"; SQL 
statement:

select aufgabenliste_seq.nextval [50000-193]

at org.h2.message.DbException.getJdbcSQLException(DbException.java:345)

at org.h2.message.DbException.get(DbException.java:168)

at org.h2.message.DbException.convert(DbException.java:295)

at org.h2.command.Command.executeQuery(Command.java:213)

at org.h2.jdbc.JdbcPreparedStatement.executeQuery(
JdbcPreparedStatement.java:110)

at org.apache.tomcat.dbcp.dbcp2.DelegatingPreparedStatement.executeQuery(
DelegatingPreparedStatement.java:82)

at org.apache.tomcat.dbcp.dbcp2.DelegatingPreparedStatement.executeQuery(
DelegatingPreparedStatement.java:82)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(
NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(
DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:483)

at de.nikem.nest.jdbc.PreparedStatementInvocationHandler.invoke(
PreparedStatementInvocationHandler.java:47)

at com.sun.proxy.$Proxy43.executeQuery(Unknown Source)

at de.nikem.nest.jdbc.JdbcUtil$2.doWork(JdbcUtil.java:490)

at de.nikem.nest.jdbc.JdbcUtil$2.doWork(JdbcUtil.java:482)

at de.nikem.nest.jdbc.JdbcUtil.doWithoutTransaction(JdbcUtil.java:451)

at de.nikem.nest.jdbc.JdbcUtil.executeNamedQuery(JdbcUtil.java:482)

at de.nikem.nest.jdbc.JdbcUtil.lambda$getNextValue$2(JdbcUtil.java:392)

at de.nikem.nest.jdbc.JdbcUtil$$Lambda$9/1477668869.doWork(Unknown Source)

at de.nikem.nest.jdbc.JdbcUtil$TransactionWork.doWork(JdbcUtil.java:219)

at de.nikem.nest.jdbc.JdbcUtil.doWithoutTransaction(JdbcUtil.java:451)

at de.nikem.nest.jdbc.JdbcUtil.doInTransaction(JdbcUtil.java:423)

at de.nikem.nest.jdbc.JdbcUtil.getNextValue(JdbcUtil.java:390)

at shopfloor.db.dao.gen.GenAufgabenlisteDao.lambda$0(
GenAufgabenlisteDao.java:28)

at 
shopfloor.db.dao.gen.GenAufgabenlisteDao$$Lambda$8/103904531.doWork(Unknown 
Source)

at de.nikem.nest.jdbc.JdbcUtil$TransactionWork.doWork(JdbcUtil.java:219)

at de.nikem.nest.jdbc.JdbcUtil.doWithoutTransaction(JdbcUtil.java:451)

at de.nikem.nest.jdbc.JdbcUtil.doInTransaction(JdbcUtil.java:423)

at shopfloor.db.dao.gen.GenAufgabenlisteDao.insert(
GenAufgabenlisteDao.java:25)

at 
shopfloor.interactor.aufgabenliste.AufgabenlisteInteractor.saveAufgabenListe(
AufgabenlisteInteractor.java:43)

at 
shopfloor.presenter.aufgabenliste.SchichtberichtPresenter.saveSchichtbericht(
SchichtberichtPresenter.java:72)

at 
shopfloor.resource.aufgabenliste.AufgabenlisteResource.insertSchichtbericht(
AufgabenlisteResource.java:73)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(
NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(
DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:483)

at 
org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(
ResourceMethodInvocationHandlerFactory.java:81)

at 
org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(
AbstractJavaResourceMethodDispatcher.java:144)

at 
org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(
AbstractJavaResourceMethodDispatcher.java:161)

at 
org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ObjectOutInvoker.doDispatch(
JavaResourceMethodDispatcherProvider.java:176)

at 
org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(
AbstractJavaResourceMethodDispatcher.java:99)

at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(
ResourceMethodInvoker.java:389)

at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(
ResourceMethodInvoker.java:347)

at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(
ResourceMethodInvoker.java:102)

at org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:326)

at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)

at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)

at org.glassfish.jersey.internal.Errors.process(Errors.java:315)

at org.glassfish.jersey.internal.Errors.process(Errors.java:297)

at org.glassfish.jersey.internal.Errors.process(Errors.java:267)

at org.glassfish.jersey.process.internal.RequestScope.runInScope(
RequestScope.java:317)

at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305)

at org.glassfish.jersey.server.ApplicationHandler.handle(
ApplicationHandler.java:1154)

at org.glassfish.jersey.servlet.WebComponent.serviceImpl(
WebComponent.java:473)

at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:427)

at org.glassfish.jersey.servlet.ServletContainer.service(
ServletContainer.java:388)

at org.glassfish.jersey.servlet.ServletContainer.service(
ServletContainer.java:341)

at org.glassfish.jersey.servlet.ServletContainer.service(
ServletContainer.java:228)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
ApplicationFilterChain.java:230)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(
ApplicationFilterChain.java:165)

at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
ApplicationFilterChain.java:192)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(
ApplicationFilterChain.java:165)

at shopfloor.resource.AbteilungFilter.doFilter(AbteilungFilter.java:67)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
ApplicationFilterChain.java:192)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(
ApplicationFilterChain.java:165)

at de.nikem.nest.filter.NestFilter.doFilter(NestFilter.java:36)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
ApplicationFilterChain.java:192)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(
ApplicationFilterChain.java:165)

at shopfloor.resource.MdcFilter.doFilter(MdcFilter.java:31)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
ApplicationFilterChain.java:192)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(
ApplicationFilterChain.java:165)

at org.apache.catalina.core.StandardWrapperValve.invoke(
StandardWrapperValve.java:199)

at org.apache.catalina.core.StandardContextValve.invoke(
StandardContextValve.java:108)

at org.apache.catalina.authenticator.AuthenticatorBase.invoke(
AuthenticatorBase.java:586)

at org.apache.catalina.core.StandardHostValve.invoke(
StandardHostValve.java:140)

at org.apache.catalina.valves.ErrorReportValve.invoke(
ErrorReportValve.java:79)

at org.apache.catalina.valves.AbstractAccessLogValve.invoke(
AbstractAccessLogValve.java:620)

at org.apache.catalina.core.StandardEngineValve.invoke(
StandardEngineValve.java:87)

at org.apache.catalina.connector.CoyoteAdapter.service(
CoyoteAdapter.java:349)

at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:784
)

at org.apache.coyote.AbstractProcessorLight.process(
AbstractProcessorLight.java:66)

at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(
AbstractProtocol.java:802)

at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(
NioEndpoint.java:1452)

at org.apache.tomcat.util.net.SocketProcessorBase.run(
SocketProcessorBase.java:49)

at java.util.concurrent.ThreadPoolExecutor.runWorker(
ThreadPoolExecutor.java:1142)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(
ThreadPoolExecutor.java:617)

at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(
TaskThread.java:61)

at java.lang.Thread.run(Thread.java:744)

Caused by: java.lang.RuntimeException: Unexpected code path

at org.h2.message.DbException.throwInternalError(DbException.java:242)

at org.h2.message.DbException.throwInternalError(DbException.java:255)

at org.h2.engine.Session.addLock(Session.java:842)

at org.h2.mvstore.db.MVTable.doLock2(MVTable.java:254)

at org.h2.mvstore.db.MVTable.doLock1(MVTable.java:202)

at org.h2.mvstore.db.MVTable.lock(MVTable.java:167)

at org.h2.engine.Database.lockMeta(Database.java:909)

at org.h2.engine.Database.removeSchemaObject(Database.java:1842)

at org.h2.table.Table.removeChildrenAndResources(Table.java:530)

at org.h2.table.TableView.removeChildrenAndResources(TableView.java:414)

at org.h2.engine.Session.cleanTempTables(Session.java:948)

at org.h2.engine.Session.commit(Session.java:643)

at org.h2.schema.Sequence.flush(Sequence.java:302)

at org.h2.schema.Sequence.getNext(Sequence.java:269)

at org.h2.expression.SequenceValue.getValue(SequenceValue.java:30)

at org.h2.command.dml.Select.queryFlat(Select.java:549)

at org.h2.command.dml.Select.queryWithoutCache(Select.java:655)

at org.h2.command.dml.Query.query(Query.java:341)

at org.h2.command.dml.Query.query(Query.java:309)

at org.h2.command.dml.Query.query(Query.java:36)

at org.h2.command.CommandContainer.query(CommandContainer.java:110)

at org.h2.command.Command.executeQuery(Command.java:201)
... 85 more 

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