What are the auto-created tables by Axon for? - axon

Question

Before the tables pop up, I first added an #EventHandler annotated method in a Spring Component like below:
#RequiredArgsConstructor
#Component
#ProcessingGroup("member-info")
public class MemberProjector {
private final MemberRepo repo;
#EventHandler
public void handle(CreatedPaymentEvent evt){
// TODO : user valid
}
// ...
}
When I ran the application I got the following exceptions:
org.springframework.context.ApplicationContextException: Failed to start bean 'org.axonframework.spring.config.AxonConfiguration'; nested exception is org.axonframework.lifecycle.LifecycleHandlerInvocationException: One of the start handlers in phase [null] failed with the following exception:
at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:181) ~[spring-context-5.3.9.jar:5.3.9]
at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:54) ~[spring-context-5.3.9.jar:5.3.9]
at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:356) ~[spring-context-5.3.9.jar:5.3.9]
at java.base/java.lang.Iterable.forEach(Iterable.java:75) ~[na:na]
at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:155) ~[spring-context-5.3.9.jar:5.3.9]
at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:123) ~[spring-context-5.3.9.jar:5.3.9]
at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:935) ~[spring-context-5.3.9.jar:5.3.9]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:586) ~[spring-context-5.3.9.jar:5.3.9]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) ~[spring-boot-2.5.3.jar:2.5.3]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754) ~[spring-boot-2.5.3.jar:2.5.3]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:434) ~[spring-boot-2.5.3.jar:2.5.3]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:338) ~[spring-boot-2.5.3.jar:2.5.3]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1343) ~[spring-boot-2.5.3.jar:2.5.3]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1332) ~[spring-boot-2.5.3.jar:2.5.3]
at com.payment.PaymentApplication.main(PaymentApplication.java:9) ~[main/:na]
Caused by: org.axonframework.lifecycle.LifecycleHandlerInvocationException: One of the start handlers in phase [null] failed with the following exception:
at org.axonframework.config.DefaultConfigurer.lambda$invokeStartHandlers$35(DefaultConfigurer.java:693) ~[axon-configuration-4.5.3.jar:4.5.3]
at org.axonframework.config.DefaultConfigurer.invokeLifecycleHandlers(DefaultConfigurer.java:744) ~[axon-configuration-4.5.3.jar:4.5.3]
at org.axonframework.config.DefaultConfigurer.invokeStartHandlers(DefaultConfigurer.java:687) ~[axon-configuration-4.5.3.jar:4.5.3]
at org.axonframework.config.DefaultConfigurer$ConfigurationImpl.start(DefaultConfigurer.java:811) ~[axon-configuration-4.5.3.jar:4.5.3]
at org.axonframework.spring.config.AxonConfiguration.start(AxonConfiguration.java:199) ~[axon-spring-4.5.3.jar:4.5.3]
at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:178) ~[spring-context-5.3.9.jar:5.3.9]
... 14 common frames omitted
Caused by: java.util.concurrent.ExecutionException: org.axonframework.lifecycle.LifecycleHandlerInvocationException: Failed during invocation of lifecycle handler [public void org.axonframework.axonserver.connector.processor.EventProcessorControlService.start()] on component [org.axonframework.axonserver.connector.processor.EventProcessorControlService#24ea71d]
at java.base/java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:395) ~[na:na]
at java.base/java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2093) ~[na:na]
at org.axonframework.config.DefaultConfigurer.invokeLifecycleHandlers(DefaultConfigurer.java:742) ~[axon-configuration-4.5.3.jar:4.5.3]
... 18 common frames omitted
Caused by: org.axonframework.lifecycle.LifecycleHandlerInvocationException: Failed during invocation of lifecycle handler [public void org.axonframework.axonserver.connector.processor.EventProcessorControlService.start()] on component [org.axonframework.axonserver.connector.processor.EventProcessorControlService#24ea71d]
at org.axonframework.config.LifecycleHandlerInspector.invokeAndReturn(LifecycleHandlerInspector.java:128) ~[axon-configuration-4.5.3.jar:4.5.3]
at org.axonframework.config.LifecycleHandlerInspector.lambda$null$0(LifecycleHandlerInspector.java:91) ~[axon-configuration-4.5.3.jar:4.5.3]
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195) ~[na:na]
at java.base/java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948) ~[na:na]
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) ~[na:na]
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) ~[na:na]
at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913) ~[na:na]
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:na]
at java.base/java.util.stream.ReferencePipeline.reduce(ReferencePipeline.java:558) ~[na:na]
at org.axonframework.config.DefaultConfigurer.invokeLifecycleHandlers(DefaultConfigurer.java:740) ~[axon-configuration-4.5.3.jar:4.5.3]
... 18 common frames omitted
Caused by: java.lang.reflect.InvocationTargetException: null
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:567) ~[na:na]
at org.axonframework.config.LifecycleHandlerInspector.invokeAndReturn(LifecycleHandlerInspector.java:121) ~[axon-configuration-4.5.3.jar:4.5.3]
... 27 common frames omitted
Caused by: org.axonframework.eventhandling.tokenstore.UnableToRetrieveIdentifierException: Exception occurred while trying to establish storage identifier
at org.axonframework.eventhandling.tokenstore.jpa.JpaTokenStore.retrieveStorageIdentifier(JpaTokenStore.java:265) ~[axon-messaging-4.5.3.jar:4.5.3]
at org.axonframework.eventhandling.TrackingEventProcessor.lambda$calculateIdentifier$4(TrackingEventProcessor.java:245) ~[axon-messaging-4.5.3.jar:4.5.3]
at org.axonframework.common.transaction.TransactionManager.fetchInTransaction(TransactionManager.java:70) ~[axon-messaging-4.5.3.jar:4.5.3]
at org.axonframework.eventhandling.TrackingEventProcessor.calculateIdentifier(TrackingEventProcessor.java:244) ~[axon-messaging-4.5.3.jar:4.5.3]
at org.axonframework.eventhandling.TrackingEventProcessor.lambda$getTokenStoreIdentifier$3(TrackingEventProcessor.java:240) ~[axon-messaging-4.5.3.jar:4.5.3]
at java.base/java.util.concurrent.atomic.AtomicReference.updateAndGet(AtomicReference.java:209) ~[na:na]
at org.axonframework.eventhandling.TrackingEventProcessor.getTokenStoreIdentifier(TrackingEventProcessor.java:240) ~[axon-messaging-4.5.3.jar:4.5.3]
at org.axonframework.axonserver.connector.processor.StreamingEventProcessorInfoMessage.describe(StreamingEventProcessorInfoMessage.java:58) ~[axon-server-connector-4.5.3.jar:4.5.3]
at org.axonframework.axonserver.connector.processor.EventProcessorControlService.lambda$infoSupplier$1(EventProcessorControlService.java:115) ~[axon-server-connector-4.5.3.jar:4.5.3]
at io.axoniq.axonserver.connector.impl.ControlChannelImpl.lambda$sendScheduledProcessorInfo$3(ControlChannelImpl.java:245) ~[axonserver-connector-java-4.5.2.jar:4.5.2]
at java.base/java.util.concurrent.ConcurrentHashMap$ValuesView.forEach(ConcurrentHashMap.java:4772) ~[na:na]
at io.axoniq.axonserver.connector.impl.ControlChannelImpl.sendScheduledProcessorInfo(ControlChannelImpl.java:245) ~[axonserver-connector-java-4.5.2.jar:4.5.2]
at io.axoniq.axonserver.connector.impl.ControlChannelImpl.registerEventProcessor(ControlChannelImpl.java:226) ~[axonserver-connector-java-4.5.2.jar:4.5.2]
at org.axonframework.axonserver.connector.processor.EventProcessorControlService.lambda$start$0(EventProcessorControlService.java:105) ~[axon-server-connector-4.5.3.jar:4.5.3]
at java.base/java.util.HashMap.forEach(HashMap.java:1338) ~[na:na]
at org.axonframework.axonserver.connector.processor.EventProcessorControlService.start(EventProcessorControlService.java:103) ~[axon-server-connector-4.5.3.jar:4.5.3]
... 32 common frames omitted
Caused by: javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not prepare statement
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:154) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.internal.SessionImpl.find(SessionImpl.java:3357) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.internal.SessionImpl.find(SessionImpl.java:3294) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:567) ~[na:na]
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:311) ~[spring-orm-5.3.9.jar:5.3.9]
at com.sun.proxy.$Proxy101.find(Unknown Source) ~[na:na]
at org.axonframework.eventhandling.tokenstore.jpa.JpaTokenStore.getConfig(JpaTokenStore.java:272) ~[axon-messaging-4.5.3.jar:4.5.3]
at org.axonframework.eventhandling.tokenstore.jpa.JpaTokenStore.retrieveStorageIdentifier(JpaTokenStore.java:263) ~[axon-messaging-4.5.3.jar:4.5.3]
... 47 common frames omitted
Caused by: org.hibernate.exception.SQLGrammarException: could not prepare statement
at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:63) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:113) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:186) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl.prepareQueryStatement(StatementPreparerImpl.java:151) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.prepareQueryStatement(AbstractLoadPlanBasedLoader.java:198) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeQueryStatement(AbstractLoadPlanBasedLoader.java:162) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeLoad(AbstractLoadPlanBasedLoader.java:104) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.loader.entity.plan.AbstractLoadPlanBasedEntityLoader.load(AbstractLoadPlanBasedEntityLoader.java:285) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.persister.entity.AbstractEntityPersister.doLoad(AbstractEntityPersister.java:4437) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:4427) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:576) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:544) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:208) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:332) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.event.internal.DefaultLoadEventListener.doOnLoad(DefaultLoadEventListener.java:108) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:74) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:110) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.internal.SessionImpl.fireLoadNoChecks(SessionImpl.java:1186) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1175) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.internal.SessionImpl.access$2100(SessionImpl.java:193) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.doLoad(SessionImpl.java:2779) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.lambda$load$1(SessionImpl.java:2767) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.perform(SessionImpl.java:2723) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.load(SessionImpl.java:2767) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.internal.SessionImpl.find(SessionImpl.java:3322) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
... 56 common frames omitted
Caused by: org.h2.jdbc.JdbcSQLSyntaxErrorException: Table "TOKEN_ENTRY" not found; SQL statement:
select tokenentry0_.processor_name as processo1_3_0_, tokenentry0_.segment as segment2_3_0_, tokenentry0_.owner as owner3_3_0_, tokenentry0_.timestamp as timestam4_3_0_, tokenentry0_.token as token5_3_0_, tokenentry0_.token_type as token_ty6_3_0_ from token_entry tokenentry0_ where tokenentry0_.processor_name=? and tokenentry0_.segment=? [42102-200]
at org.h2.message.DbException.getJdbcSQLException(DbException.java:453) ~[h2-1.4.200.jar:1.4.200]
at com.zaxxer.hikari.pool.HikariProxyConnection.prepareStatement(HikariProxyConnection.java) ~[HikariCP-4.0.3.jar:na]
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$5.doPrepare(StatementPreparerImpl.java:149) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:176) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
... 78 common frames omitted
Lastly, this is my application.yml:
server:
port: 8282
spring:
h2:
console:
enabled: true
settings:
trace : true
output.ansi.enabled: always
datasource:
url: jdbc:h2:tcp://localhost/~/delivery/payment
username: sa
password:
driver-class-name: org.h2.Driver
sql:
init :
mode : always
data-locations : classpath:data.sql
schema-locations : classpath:schema.sql
jpa:
hibernate.ddl-auto: none
generate-ddl: true
database-platform: org.hibernate.dialect.H2Dialect
application:
name: payment-service
In those error messages I found:
Caused by: org.h2.jdbc.JdbcSQLSyntaxErrorException: Table "TOKEN_ENTRY" not found
So I tried to create that table and I've been trying this and that, tables were created automatically. But I don't know why these tables are auto-created yet.
// Member is just my entity
Is it normal for a table like this to be created in the h2-DB?
I'm a beginner at Axon and I don't know where to start.

Answer 1

These tables are auto-created because you are using Axon's Spring Boot Starter in combination with a storage solution. Axon's auto-configuration spots the fact you have persistent storage and thus expects you want to have the default entities axon requires.
Let me list what they are for:
SAGA_ENTRY - Stores the serialized sagas. Read more on Sagas here.
ASSOCIATION_VALUE_ENTRY - Stores the associations from event identifiers to saga identifiers. Hence, it is the lookup table for Axon to associate your events with your sagas.
TOKEN_ENTRY - Stores the serialized TrackingToken instances your StreamingEventProcessors use for handling events. In short, these tokens keep track of the progress through the event stream. Read more on Streaming Processors and Tracking Tokens here.
Is it normal for a table like this to be created in the h2-DB?
When using Axon's Spring Auto Configuration, then yes, it is. Axon expects you need all of them, so it is created upfront.
I'm a beginner at Axon, and I don't know where to start.
enter link description hereYou should know that there is an Axon training you can follow (as found here). Either attend one of the live sessions you can find here or go for the AxonIQ Academy.