Liquibase resource found in both Maven target and Maven repository

Question

I have Eclipse Maven GWT project and I added flowable-form-engine dependency that uses Liquibase. Liquibase is searching for changelog file org/flowable/form/db/liquibase/flowable-form-db-changelog.xml but finds two!

org.flowable.common.engine.api.FlowableException: Error initialising form data schema
    at org.flowable.form.engine.impl.db.FormDbSchemaManager.initSchema(FormDbSchemaManager.java:58)
    at org.flowable.form.engine.impl.cmd.SchemaOperationsFormEngineBuild.execute(SchemaOperationsFormEngineBuild.java:29)
    at org.flowable.form.engine.impl.cmd.SchemaOperationsFormEngineBuild.execute(SchemaOperationsFormEngineBuild.java:24)
    at org.flowable.common.engine.impl.interceptor.DefaultCommandInvoker.execute(DefaultCommandInvoker.java:10)
    at org.flowable.common.engine.impl.interceptor.TransactionContextInterceptor.execute(TransactionContextInterceptor.java:53)
    at org.flowable.common.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:71)
    at org.flowable.common.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:30)
    at org.flowable.common.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:56)
    at org.flowable.form.engine.impl.FormEngineImpl.<init>(FormEngineImpl.java:45)
    at org.flowable.form.engine.FormEngineConfiguration.buildFormEngine(FormEngineConfiguration.java:172)
    at org.flowable.form.engine.configurator.FormEngineConfigurator.initFormEngine(FormEngineConfigurator.java:83)
    at org.flowable.form.engine.configurator.FormEngineConfigurator.configure(FormEngineConfigurator.java:63)
    at org.flowable.common.engine.impl.AbstractEngineConfiguration.configuratorsAfterInit(AbstractEngineConfiguration.java:859)
    at org.flowable.engine.impl.cfg.ProcessEngineConfigurationImpl.init(ProcessEngineConfigurationImpl.java:985)
    at org.flowable.engine.impl.cfg.ProcessEngineConfigurationImpl.buildProcessEngine(ProcessEngineConfigurationImpl.java:887)
    at sk.dominanz.coarui.server.services.WorkflowServiceAdditional.<clinit>(WorkflowServiceAdditional.java:64)
    ... 33 more
Caused by: liquibase.exception.ChangeLogParseException: Error Reading Migration File: Found 2 files that match org/flowable/form/db/liquibase/flowable-form-db-changelog.xml
    at liquibase.parser.core.xml.XMLChangeLogSAXParser.parseToNode(XMLChangeLogSAXParser.java:118)
    at liquibase.parser.core.xml.AbstractChangeLogParser.parse(AbstractChangeLogParser.java:15)
    at liquibase.Liquibase.getDatabaseChangeLog(Liquibase.java:217)
    at liquibase.Liquibase.update(Liquibase.java:190)
    at liquibase.Liquibase.update(Liquibase.java:179)
    at liquibase.Liquibase.update(Liquibase.java:175)
    at liquibase.Liquibase.update(Liquibase.java:168)
    at org.flowable.form.engine.impl.db.FormDbSchemaManager.initSchema(FormDbSchemaManager.java:52)
    ... 48 more
Caused by: java.io.IOException: Found 2 files that match org/flowable/form/db/liquibase/flowable-form-db-changelog.xml
    at liquibase.util.StreamUtil.singleInputStream(StreamUtil.java:206)
    at liquibase.parser.core.xml.XMLChangeLogSAXParser.parseToNode(XMLChangeLogSAXParser.java:71)
    ... 55 more

So I debugged it and it finds one resource from target directory:

jar:file:/C:/work/git/coarui/target/Main-1.0-SNAPSHOT/WEB-INF/lib/flowable-form-engine-6.4.0.jar!/org/flowable/form/db/liquibase/flowable-form-db-changelog.xml

and other resource from maven repository:

jar:file:/C:/Users/Piro/.m2/repository/org/flowable/flowable-form-engine/6.4.0/flowable-form-engine-6.4.0.jar!/org/flowable/form/db/liquibase/flowable-form-db-changelog.xml

Is there a way to ignore one of them, or is my build path or dependency definition wrong?

My build path contains:

src/main/java sources
src/test/java sources
JRE System library
Maven dependencies (in C:/Users/Piro/.m2/repository...)
JUnit4

Looking at source code resources are read classLoader.getResources(path); where class loader is jetty class loader JettyLauncher$WebAppContextWithReload$WebAppClassLoaderExtension.

In my run/debug configuration I have classpath similar to build path plus GWT library gwt-dev-2.8.1.jar - C:\Users\Piro\.m2\repository\com\google\gwt\gwt-dev\2.8.1

In pom.xml dependency is defined as:

<dependency>
  <groupId>org.flowable</groupId>
  <artifactId>flowable-form-engine-configurator</artifactId>
  <version>${flowableVersion}</version>
</dependency>

Maven GWT plugin groupId=net.ltgt.gwt.maven, artifactId=gwt-maven-plugin has configuration parameter classpathScope but I tested <classpathScope>compile+runtime</classpathScope>, <classpathScope>compile</classpathScope> and <classpathScope>runtime</classpathScope> and the same error occurs.

Searching the internet I found similar posts on flowable forum (1, 2) but no solution is provided.

score 3 · Answer 1 · answered Jan 17 '19 at 18:49

This generally happens when you mix client and server code in the same Maven module, and given how GWT works there's no (easy) around that, besides splitting your code in separate client and server (and possibly shared) Maven modules.

You can have a look at https://github.com/tbroyer/gwt-maven-archetypes for examples (disclaimer: I'm the author, but also a member of GWT's Steering Committee)

score 1 · Accepted Answer · answered Jan 18 '19 at 10:04

it seems that for some reason your .m2 is in the classpath. If it really makes sense to you then you can try to use <scope>provided</scope> in a pom where you declare dependency to flowable-form-engine-configurator. However you may decide to exclude .m2 from classpath which is better I think.

Liquibase resource found in both Maven target and Maven repository

2 Answers2