问题:
当我运行测试或从主方法运行应用程序时,drools 初始化正常并且一切正常。但是,一旦我将应用程序编译为 jar 文件(作为 fat jar),此代码就会抛出 NullPointerException
。
KieServices ks = KieServices.Factory.get();
kieContainer = ks.getKieClasspathContainer(); // ks is null
我还注意到,当从我的 ide 运行它时,ServiceDiscovery 发现了更多的 kie.conf 文件。
从 IDE 运行它
2018-05-09 18:18:12,219 [monthEnd] INFO org.kie.api.internal.utils.ServiceDiscoveryImpl - Loading kie.conf from
2018-05-09 18:18:12,221 [monthEnd] INFO org.kie.api.internal.utils.ServiceDiscoveryImpl - Discovered kie.conf url=jar:file:/C:/Users/alece/.m2/repository/org/drools/drools-decisiontables/7.6.0.Final/drools-decisiontables-7.6.0.Final.jar!/META-INF/kie.conf
2018-05-09 18:18:12,307 [monthEnd] INFO org.kie.api.internal.utils.ServiceDiscoveryImpl - Adding Service org.drools.decisiontable.DecisionTableProviderImpl
2018-05-09 18:18:12,307 [monthEnd] INFO org.kie.api.internal.utils.ServiceDiscoveryImpl - Loading kie.conf from
2018-05-09 18:18:12,308 [monthEnd] INFO org.kie.api.internal.utils.ServiceDiscoveryImpl - Discovered kie.conf url=jar:file:/C:/Users/alece/.m2/repository/org/kie/kie-internal/7.6.0.Final/kie-internal-7.6.0.Final.jar!/META-INF/kie.conf
2018-05-09 18:18:12,311 [monthEnd] INFO org.kie.api.internal.utils.ServiceDiscoveryImpl - Adding Service org.kie.internal.services.KieWeaversImpl
2018-05-09 18:18:12,313 [monthEnd] INFO org.kie.api.internal.utils.ServiceDiscoveryImpl - Adding Service org.kie.internal.services.KieBeliefsImpl
2018-05-09 18:18:12,314 [monthEnd] INFO org.kie.api.internal.utils.ServiceDiscoveryImpl - Adding Service org.kie.internal.services.KieAssemblersImpl
2018-05-09 18:18:12,315 [monthEnd] INFO org.kie.api.internal.utils.ServiceDiscoveryImpl - Adding Service org.kie.internal.services.KieRuntimesImpl
2018-05-09 18:18:12,316 [monthEnd] INFO org.kie.api.internal.utils.ServiceDiscoveryImpl - Loading kie.conf from
2018-05-09 18:18:12,316 [monthEnd] INFO org.kie.api.internal.utils.ServiceDiscoveryImpl - Discovered kie.conf url=jar:file:/C:/Users/alece/.m2/repository/org/drools/drools-core/7.6.0.Final/drools-core-7.6.0.Final.jar!/META-INF/kie.conf
2018-05-09 18:18:12,319 [monthEnd] INFO org.kie.api.internal.utils.ServiceDiscoveryImpl - Adding Service org.drools.core.io.impl.ResourceFactoryServiceImpl
2018-05-09 18:18:12,323 [monthEnd] INFO org.kie.api.internal.utils.ServiceDiscoveryImpl - Adding Service org.drools.core.marshalling.impl.MarshallerProviderImpl
2018-05-09 18:18:12,335 [monthEnd] INFO org.kie.api.internal.utils.ServiceDiscoveryImpl - Adding Service org.drools.core.concurrent.ExecutorProviderImpl
2018-05-09 18:18:12,335 [monthEnd] INFO org.kie.api.internal.utils.ServiceDiscoveryImpl - Loading kie.conf from
2018-05-09 18:18:12,336 [monthEnd] INFO org.kie.api.internal.utils.ServiceDiscoveryImpl - Discovered kie.conf url=jar:file:/C:/Users/alece/.m2/repository/org/drools/drools-compiler/7.6.0.Final/drools-compiler-7.6.0.Final.jar!/META-INF/kie.conf
2018-05-09 18:18:12,348 [monthEnd] INFO org.kie.api.internal.utils.ServiceDiscoveryImpl - Adding Service org.drools.compiler.kie.builder.impl.KieServicesImpl
2018-05-09 18:18:12,357 [monthEnd] INFO org.kie.api.internal.utils.ServiceDiscoveryImpl - Adding Service org.drools.compiler.builder.impl.KnowledgeBuilderFactoryServiceImpl
运行编译好的jar
2018-05-09 18:14:02,771 [monthEnd] INFO org.kie.api.internal.utils.ServiceDiscoveryImpl - Loading kie.conf from
2018-05-09 18:14:02,772 [monthEnd] INFO org.kie.api.internal.utils.ServiceDiscoveryImpl - Discovered kie.conf url=jar:file:/C:/Users/alece/git-idea/directpay-monthend/target/monthend-1.0.0.jar!/META-INF/kie.conf
2018-05-09 18:14:02,773 [monthEnd] INFO org.kie.api.internal.utils.ServiceDiscoveryImpl - Adding Service org.drools.decisiontable.DecisionTableProviderImpl
我的pom文件
<properties>
<drools.version>7.6.0.Final</drools.version>
</properties>
<!-- Drools -->
<dependency>
<groupId>org.kie</groupId>
<artifactId>kie-api</artifactId>
<version>${drools.version}</version>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-decisiontables</artifactId>
<version>${drools.version}</version>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-core</artifactId>
<version>${drools.version}</version>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-compiler</artifactId>
<version>${drools.version}</version>
</dependency>
提前致谢。
最佳答案
问题是,当您编译 jar 时,您将覆盖 META-INF/kie.conf
文件。
罗布向我指出了正确的解决方案。由于您的解决方法不起作用,因此将其添加到 pom.xml
解决了我的问题:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.2.0</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
<resource>META-INF/kie.conf</resource>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
关于java - 将 Drools 作为 fat jar 运行(将 drools 编译到 jar 中),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/50258016/