編譯項目出現如下錯誤：
DEBUG com.datastax.oss.driver.internal.core.util.Reflection - Could not load com.mango.mgimdao.cassandra.dao.XXXDao: java.lang.ClassNotFoundException: com.mango.mgimdao.cassandra.dao.XXXDao
java.lang.ClassNotFoundException: com.mango.mgimdao.cassandra.dao.XXXDao
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at com.datastax.oss.driver.internal.core.util.Reflection.loadClass(Reflection.java:55)
at com.datastax.oss.driver.internal.mapper.processor.dao.DaoMethodGenerator.isFromClassFile(DaoMethodGenerator.java:235)
at com.datastax.oss.driver.internal.mapper.processor.dao.DaoMethodGenerator.validateCqlNamesPresent(DaoMethodGenerator.java:196)
at com.datastax.oss.driver.internal.mapper.processor.dao.DaoQueryMethodGenerator.generate(DaoQueryMethodGenerator.java:113)
at java.util.Optional.flatMap(Optional.java:241)
at com.datastax.oss.driver.internal.mapper.processor.dao.DaoImplementationGenerator.getContents(DaoImplementationGenerator.java:330)
at com.datastax.oss.driver.internal.mapper.processor.SingleFileCodeGenerator.generate(SingleFileCodeGenerator.java:43)
at com.datastax.oss.driver.internal.mapper.processor.MapperProcessor.processAnnotatedTypes(MapperProcessor.java:117)
at com.datastax.oss.driver.internal.mapper.processor.MapperProcessor.process(MapperProcessor.java:83)
at com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor(JavacProcessingEnvironment.java:794)
at com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:705)
at com.sun.tools.javac.processing.JavacProcessingEnvironment.access$1800(JavacProcessingEnvironment.java:91)
at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1035)
at com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1176)
at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1170)
at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:856)
at com.sun.tools.javac.main.Main.compile(Main.java:523)
at com.sun.tools.javac.api.JavacTaskImpl.doCall(JavacTaskImpl.java:129)
at com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:138)
at org.codehaus.plexus.compiler.javac.JavaxToolsCompiler.compileInProcess(JavaxToolsCompiler.java:126)
at org.codehaus.plexus.compiler.javac.JavacCompiler.performCompile(JavacCompiler.java:174)
at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:1134)
at org.apache.maven.plugin.compiler.CompilerMojo.execute(CompilerMojo.java:187)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)
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:498)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
雖然上面的問題並不影響編譯後install，但是總是要處理下：
解決方案：在pom.xml中加入如下：
<project>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source> <!-- (or higher) -->
<target>1.8</target> <!-- (or higher) -->
<annotationProcessorPaths>
<path>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.12</version>
</path>
<path>
<groupId>com.datastax.oss</groupId>
<artifactId>java-driver-mapper-processor</artifactId>
<version>4.7.2</version>
</path>
</annotationProcessorPaths>
</configuration>
</plugin>
</plugins>
</build>
</project>
參考連接：https://docs.datastax.com/en/developer/java-driver/4.6/manual/mapper/config/