[英]Running Drools as a fat jar(Compile drools into jar)
問題:
當我運行我的測試或從主方法運行我的應用程序時,drools 初始化很好並且一切正常。 但是一旦我將我的應用程序編譯為一個 jar 文件(作為一個胖 jar),這段代碼就會拋出一個NullPointerException
。
KieServices ks = KieServices.Factory.get();
kieContainer = ks.getKieClasspathContainer(); // ks is null
我還注意到,當從我的 ide 運行它時,ServiceDiscovery 會發現更多 kie.conf 文件。
從 IDE 運行它
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
運行編譯的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>
提前致謝。
問題在於,當您編譯 jar 時,您正在覆蓋META-INF/kie.conf
文件。
Rob 向我指出了正確的解決方案。 由於您的解決方法沒有解決,將它添加到pom.xml
解決了我的問題:
<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>
對於基於 Gradle+Kotlin 的構建,
named<ShadowJar>("shadowJar") {
transform(AppendingTransformer::class.java) {
resource = "META-INF/kie.conf"
}
}
上面的代碼應該可以工作。
添加到 kaanchabhau 的答案中,如果這是 gradle,您將擁有:
shadowJar {
append 'META-INF/kie.conf'
manifest {
attributes 'Main-Class': mainClassName
}
}
好的,這是一個丑陋的解決方法。 問題在於,當您編譯 jar 時,您正在覆蓋 META-INF/kie.conf 文件。 所以我需要做的是將所有依賴項 kie.conf 文件合並到一個 conf 中。
這是最終結果
org.drools.compiler.compiler.DecisionTableProvider = org.drools.decisiontable.DecisionTableProviderImpl
org.kie.api.KieServices = org.drools.compiler.kie.builder.impl.KieServicesImpl
org.kie.internal.builder.KnowledgeBuilderFactoryService = org.drools.compiler.builder.impl.KnowledgeBuilderFactoryServiceImpl
org.kie.api.internal.assembler.KieAssemblers = org.kie.internal.services.KieAssemblersImpl
org.kie.api.internal.runtime.KieRuntimes = org.kie.internal.services.KieRuntimesImpl
org.kie.api.internal.weaver.KieWeavers = org.kie.internal.services.KieWeaversImpl
org.kie.api.internal.runtime.beliefs.KieBeliefs = org.kie.internal.services.KieBeliefsImpl
org.kie.api.io.KieResources = org.drools.core.io.impl.ResourceFactoryServiceImpl
org.kie.api.marshalling.KieMarshallers = org.drools.core.marshalling.impl.MarshallerProviderImpl
org.kie.api.concurrent.KieExecutors = org.drools.core.concurrent.ExecutorProviderImpl
如果有人知道更好的方法來做這個,請在此處發布。
嘗試了所有方法,唯一對我有用的 maven 插件是 spring-boot-maven-plugin,即使您不使用 spring boot:
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>2.3.3.RELEASE</version>
<configuration>
<mainClass>${main.class}</mainClass>
<layout>ZIP</layout>
</configuration>
</plugin>
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