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我有 Eclipse Maven GWT 项目，并添加flowable-form-engine了使用 Liquibase 的依赖项。Liquibase 正在搜索更改日志文件org/flowable/form/db/liquibase/flowable-form-db-changelog.xml，但找到了两个！

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

所以我对其进行了调试，它从目标目录中找到了一个资源：

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

以及来自 Maven 存储库的其他资源：

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

有没有办法忽略其中一个，或者我的构建路径或依赖定义错误？

我的构建路径包含：

  • src/main/java 来源
  • src/test/java 源
  • JRE 系统库
  • Maven 依赖项（在 C:/Users/Piro/.m2/repository...）
  • JUnit4

查看源代码资源读取classLoader.getResources(path);其中类加载器是码头类加载器JettyLauncher$WebAppContextWithReload$WebAppClassLoaderExtension。

在我的运行/调试配置中，我有类似于构建路径和 GWT 库的类路径gwt-dev-2.8.1.jar - C:\Users\Piro\.m2\repository\com\google\gwt\gwt-dev\2.8.1

pom.xml依赖关系定义为：

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

Maven GWT 插件groupId=net.ltgt.gwt.maven, artifactId=gwt-maven-plugin有配置参数classpathScope，但我测试过<classpathScope>compile+runtime</classpathScope>，<classpathScope>compile</classpathScope>并且<classpathScope>runtime</classpathScope>发生了同样的错误。

搜索互联网，我在 flowable 论坛（1、2 ）上找到了类似的帖子，但没有提供解决方案。

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2 回答 2

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当您在同一个 Maven 模块中混合客户端和服务器代码时，通常会发生这种情况，并且考虑到 GWT 的工作方式，除了将您的代码拆分为单独的客户端和服务器（可能是共享的）Maven 模块之外，没有（容易）解决这个问题。

您可以查看https://github.com/tbroyer/gwt-maven-archetypes的示例（免责声明：我是作者，也是 GWT 指导委员会的成员）

于 2019-01-17T18:49:23.313 回答
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似乎由于某种原因你.m2在类路径中。如果它真的对你有意义，那么你可以尝试<scope>provided</scope>在你声明依赖的 pom 中使用flowable-form-engine-configurator. 但是，您可能决定.m2从我认为更好的类路径中排除。

于 2019-01-18T10:04:12.087 回答