如何修复 jOOQ 代码生成工具错误？

Question

我正在使用 Spring Boot 2.1.1 和 jOOQ 代码生成工具 3.11.7。我有一个 Java 类配置为稍微修改从 pom.xml 中的 MySQL 表名派生的类名：

<generator>
  <target>
    <packageName>com.example.foglight.db</packageName>
    <directory>src/main/java</directory>
  </target>
  <database>
    <excludes>
      flyway_schema_history
      | information_schema.*
    </excludes>
    <inputSchema>${dbName}</inputSchema>
    <outputSchemaToDefault>true</outputSchemaToDefault>
    <forcedTypes>
      <forcedType>
        <userType>java.util.UUID</userType>
        <binding>com.example.foglight.config.db.MysqlUuidBinding</binding>
        <types>BINARY\(16\)</types>
      </forcedType>
    </forcedTypes>
  </database>
  <generate>
    <deprecationOnUnknownTypes>false</deprecationOnUnknownTypes>
    <pojos>true</pojos>
  </generate>
  <!-- The default code generator. You can override this one, to generate your own code style
        Defaults to org.jooq.codegen.JavaGenerator -->
  <name>org.jooq.codegen.JavaGenerator</name>
  <!-- The naming strategy used for class and field names.
        You may override this with your custom naming strategy. Some examples follow
        Defaults to org.jooq.codegen.DefaultGeneratorStrategy -->
  <strategy>
 <name>com.example.foglight.config.db.DatabaseModelNamingStrategy</name>
  </strategy>
</generator>

当我从 IntelliJ 构建/运行应用程序时一切正常，但是当我在同一环境中从命令行运行 mvn generate-sources 或 mvn install 时，我收到以下错误：

[ERROR] Failed to execute goal org.jooq:jooq-codegen-maven:3.11.7:generate (default) on project foglight: Error running jOOQ code generation tool: com.example.foglight.config.db.DatabaseModelNamingStrategy -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.jooq:jooq-codegen-maven:3.11.7:generate (default) on project foglight: Error running jOOQ code generation tool

下面有详细解释：

Caused by: java.lang.ClassNotFoundException: com.example.foglight.config.db.DatabaseModelNamingStrategy
    at java.net.URLClassLoader.findClass (URLClassLoader.java:471)
    at java.lang.ClassLoader.loadClass (ClassLoader.java:588)
    at java.lang.ClassLoader.loadClass (ClassLoader.java:521)
    at org.jooq.codegen.GenerationTool.loadClass (GenerationTool.java:819)
    at org.jooq.codegen.GenerationTool.run (GenerationTool.java:352)
    at org.jooq.codegen.GenerationTool.generate (GenerationTool.java:220)
    at org.jooq.codegen.maven.Plugin.execute (Plugin.java:197)

类就在那里（否则 IntelliJ 也会抛出错误）。 IDE 是否还在做其他事情以使其正常工作？

Answer 1

您可以按照 Lukas Eder 的建议编译该类并将其放在类路径中。为此，使用 maven-compiler-plugin 引入另一个执行并将其绑定到 generate-sources 阶段：

      <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
         <version>3.8.1</version>
         <executions>
         <execution>
              <phase>generate-sources</phase>
              <goals>
                <goal>compile</goal>
              </goals>
             <configuration>
                <source>1.8</source>
                <target>1.8</target>
                <includes>
                   <include>tb/database/jooq/custom/namingstrategies/*.java</include>
                </includes>
             </configuration>
         </execution>
         </executions>
      </plugin>

Answer 2

jOOQ 代码生成器必须能够通过类路径访问您的生成器策略，这意味着它必须在您运行代码生成器之前进行编译。由于代码生成器通常在包含它的 Maven 模块的编译阶段之前运行，因此您必须将生成器策略提取到另一个模块中以确保它在之前被编译。