我是Maven和流口水的新手。我正在研究java / DROOLS项目。当我想使用kjar打包类型构建项目，而Drools版本高于7.7.0时，通过键入命令mvn clean package会引发错误消息。但是，对于较低版本的口水，例如7.6.0，构建成功。我会使用7.6.0版本，但是有些错误只能在最新版本中解决。
我试图更改流口水的版本，所以我停在7.6.0。这是最高的成功版本。另外，我将包装类型更改为jar，maven成功构建了所有版本的项目，但是我需要kjar的kie-server包装类型。
这是我的pom.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.sample</groupId>
<artifactId>testProject</artifactId>
<version>1.0.0-SNAPSHOT</version>
<packaging>kjar</packaging>
<name>Drools :: Sample Maven Project</name>
<description>A sample Drools Maven project</description>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<runtime.version>7.22.0.Final</runtime.version>
</properties>
<dependencies>
<dependency>
<groupId>org.kie</groupId>
<artifactId>kie-api</artifactId>
<version>${runtime.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-core</artifactId>
<version>${runtime.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-decisiontables</artifactId>
<version>${runtime.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.jbpm</groupId>
<artifactId>jbpm-test</artifactId>
<version>${runtime.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.kie</groupId>
<artifactId>kie-maven-plugin</artifactId>
<version>${runtime.version}</version>
<extensions>true</extensions>
</plugin>
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<configuration>
<resources>
<resources>
<directory>src/main/resources</directory>
</resources>
<testResources>
<directory>src/test/resources</directory>
</testResources>
</resources>
</configuration>
</plugin>
</plugins>
</build>
<distributionManagement>
<repository>
<id>myMavenRepoWrite</id>
<url>${myMavenRepoWriteUrl}</url>
</repository>
<snapshotRepository>
<id>myMavenRepoWrite</id>
<url>${myMavenRepoWriteUrl}</url>
</snapshotRepository>
</distributionManagement>
<profiles>
<profile>
<repositories>
<repository>
<id>jboss-public-repository-group</id>
<name>JBoss Public Maven Repository Group</name>
<url>https://repository.jboss.org/nexus/content/groups/public-jboss/</url>
<layout>default</layout>
<releases>
<enabled>true</enabled>
<updatePolicy>never</updatePolicy>
</releases>
<snapshots>
<enabled>true</enabled>
<updatePolicy>always</updatePolicy>
</snapshots>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>jboss-public-repository-group</id>
<name>JBoss Public Maven Repository Group</name>
<url>https://repository.jboss.org/nexus/content/groups/public-jboss/</url>
<layout>default</layout>
<releases>
<enabled>true</enabled>
<updatePolicy>never</updatePolicy>
</releases>
<snapshots>
<enabled>true</enabled>
<updatePolicy>never</updatePolicy>
</snapshots>
</pluginRepository>
</pluginRepositories>
</profile>
</profiles>
</project>
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.431 s
[INFO] Finished at: 2019-06-03T11:18:33+06:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.kie:kie-maven-plugin:7.22.0.Final:build (default-build) on project testProject: Execution default-build of goal org.kie:kie-maven-plugin:7.22.0.Final:build failed.: NullPointerException -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.kie:kie-maven-plugin:7.22.0.Final:build (default-build) on project testProject: Execution default-build of goal org.kie:kie-maven-plugin:7.22.0.Final:build failed.
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:215)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke (Method.java:566)
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)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution default-build of goal org.kie:kie-maven-plugin:7.22.0.Final:build failed.
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:148)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke (Method.java:566)
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)
Caused by: java.lang.NullPointerException
at org.drools.decisiontable.parser.DefaultRuleSheetListener.flushRule (DefaultRuleSheetListener.java:306)
at org.drools.decisiontable.parser.DefaultRuleSheetListener.finishSheet (DefaultRuleSheetListener.java:286)
at org.drools.decisiontable.parser.xls.ExcelParser.finishSheet (ExcelParser.java:285)
at org.drools.decisiontable.parser.xls.ExcelParser.processSheet (ExcelParser.java:220)
at org.drools.decisiontable.parser.xls.ExcelParser.parseWorkbook (ExcelParser.java:111)
at org.drools.decisiontable.parser.xls.ExcelParser.parseFile (ExcelParser.java:85)
at org.drools.decisiontable.SpreadsheetCompiler.parseResource (SpreadsheetCompiler.java:136)
at org.drools.decisiontable.SpreadsheetCompiler.compile (SpreadsheetCompiler.java:120)
at org.drools.decisiontable.SpreadsheetCompiler.compile (SpreadsheetCompiler.java:93)
at org.drools.decisiontable.DecisionTableProviderImpl.compileResource (DecisionTableProviderImpl.java:70)
at org.drools.decisiontable.DecisionTableProviderImpl.loadFromResource (DecisionTableProviderImpl.java:42)
at org.drools.compiler.compiler.DecisionTableFactory.loadFromResource (DecisionTableFactory.java:36)
at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.decisionTableToPackageDescr (KnowledgeBuilderImpl.java:415)
at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl$ResourceToPkgDescrMapper.lambda$static$4 (CompositeKnowledgeBuilderImpl.java:327)
at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.buildResource (CompositeKnowledgeBuilderImpl.java:199)
at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.buildPackageDescr (CompositeKnowledgeBuilderImpl.java:186)
at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.build (CompositeKnowledgeBuilderImpl.java:108)
at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.build (CompositeKnowledgeBuilderImpl.java:100)
at org.drools.compiler.kie.builder.impl.AbstractKieProject.buildKnowledgePackages (AbstractKieProject.java:261)
at org.drools.compiler.kie.builder.impl.AbstractKieProject.verify (AbstractKieProject.java:75)
at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildKieProject (KieBuilderImpl.java:270)
at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildAll (KieBuilderImpl.java:238)
at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildAll (KieBuilderImpl.java:187)
at org.drools.compiler.kie.builder.impl.KieBuilderImpl.getKieModule (KieBuilderImpl.java:493)
at org.drools.compiler.kie.builder.impl.KieBuilderImpl.getKieModule (KieBuilderImpl.java:483)
at org.kie.maven.plugin.BuildMojo.buildDrl (BuildMojo.java:169)
at org.kie.maven.plugin.BuildMojo.execute (BuildMojo.java:118)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke (Method.java:566)
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)
[ERROR]
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginExecutionException
如果您想重现该问题，请访问以下链接： https://github.com/Kusbek/droolsTestProject