Spring Boot with Camunda Application

Question

I have some problems understanding Spring Boot + Camunda.

Basically I want to have a backend (REST) for my application. For that I have created a Spring Boot Java project. It runs perfectly. Now I want to include Camunda BPM workflow into my application for the processes.

I have added the dependencies to my pom.xml:

    <?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>de.countandcare</groupId>
    <artifactId>carorderprocess</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>carorderprocess</name>
    <description>Demo project for Spring Boot</description>

    <dependencyManagement>
    <dependencies>
        <dependency>
            <!-- Import dependency management from camunda -->
            <groupId>org.camunda.bpm</groupId>
            <artifactId>camunda-bom</artifactId>
            <version>${camunda.version}</version>
            <scope>import</scope>
            <type>pom</type>
        </dependency>
    </dependencies>
    </dependencyManagement>


    <properties>
        <java.version>1.8</java.version>
        <camunda.version>7.9.0-ee</camunda.version>
        <camunda.boot.version>3.0.0</camunda.boot.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.camunda.bpm.springboot</groupId>
            <artifactId>camunda-bpm-spring-boot-starter-webapp-ee</artifactId>
            <version>${camunda.boot.version}</version>
        </dependency>

        <dependency>
            <groupId>org.camunda.bpm.extension</groupId>
            <artifactId>camunda-bpm-assert</artifactId>
            <version>1.2</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.camunda.bpm.extension</groupId>
            <artifactId>camunda-bpm-mockito</artifactId>
            <scope>test</scope>
            <version>2.0</version>
            <exclusions>
                <exclusion>
                    <groupId>org.assertj</groupId>
                    <artifactId>assertj-core</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <version>1.2.132</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-api</artifactId>
            <version>5.5.2</version>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <executions>
                    <execution>
                        <id>compile</id>
                        <phase>compile</phase>
                        <goals>
                            <goal>compile</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>

My Main class is:

    package de.countandcare.carorderprocess;
 
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;


    @SpringBootApplication
    public class CarorderprocessApplication {

    public static void main(String[] args) {
        SpringApplication.run(CarorderprocessApplication.class, args);
    }

    }

And I have a controller:

    package de.countandcare.carorderprocess.controller;
    
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class OrderController {
    
        @GetMapping(value = "/")
        public String index() {
            return "index";
        }
    
    }

Now I want to reach my application on localhost:8080/ which should return index.

Now when I run the application I get this error:

        objc[39624]: Class JavaLaunchHelper is implemented in both /Library/Java/JavaVirtualMachines/jdk1.8.0_151.jdk/Contents/Home/bin/java (0x1029c34c0) and /Library/Java/JavaVirtualMachines/jdk1.8.0_151.jdk/Contents/Home/jre/lib/libinstrument.dylib (0x102a8b4e0). One of the two will be used. Which one is undefined.
    
     ____                                 _         ____  ____  __  __
    / ___| __ _ _ __ ___  _   _ _ __   __| | __ _  | __ )|  _ \|  \/  |
    | |   / _` | '_ ` _ \| | | | '_ \ / _` |/ _` | |  _ \| |_) | |\/| |
    | |__| (_| | | | | | | |_| | | | | (_| | (_| | | |_) |  __/| |  | |
    \____/\__,_|_| |_| |_|\__,_|_| |_|\__,_|\__,_| |____/|_|   |_|  |_|
    
      Spring-Boot:  (v2.1.5.RELEASE)
      Camunda BPM: (v7.9.0-ee)
      Camunda BPM Spring Boot Starter: (v3.0.0)
    
    2019-11-12 21:47:41.175  INFO 39624 --- [           main] d.c.c.CarorderprocessApplication         : Starting CarorderprocessApplication on U2007750s-MBP.fritz.box with PID 39624 (/Users/u2007750/CC/Develop/projects/Kfz-Bestellprozess/backend/carorderprocess/target/classes started by u2007750 in /Users/u2007750/CC/Develop/projects/Kfz-Bestellprozess/backend/carorderprocess)
    2019-11-12 21:47:41.177  INFO 39624 --- [           main] d.c.c.CarorderprocessApplication         : No active profile set, falling back to default profiles: default
    2019-11-12 21:47:41.888  INFO 39624 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
    2019-11-12 21:47:41.904  INFO 39624 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
    2019-11-12 21:47:41.904  INFO 39624 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.19]
    2019-11-12 21:47:41.978  INFO 39624 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
    2019-11-12 21:47:41.979  INFO 39624 --- [           main] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 774 ms
    2019-11-12 21:47:42.161  INFO 39624 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
    2019-11-12 21:47:42.219  INFO 39624 --- [           main] o.s.b.a.w.s.WelcomePageHandlerMapping    : Adding welcome page: class path resource [META-INF/resources/index.html]
    2019-11-12 21:47:42.228  INFO 39624 --- [           main] org.camunda.bpm.spring.boot              : STARTER-SB040 Setting up jobExecutor with corePoolSize=3, maxPoolSize:10
    2019-11-12 21:47:42.229  INFO 39624 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'camundaTaskExecutor'
    2019-11-12 21:47:42.242  WARN 39624 --- [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'processEngineConfigurationImpl' defined in class path resource [org/camunda/bpm/spring/boot/starter/CamundaBpmConfiguration.class]: Unsatisfied dependency expressed through method 'processEngineConfigurationImpl' parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'camundaDatasourceConfiguration': Unsatisfied dependency expressed through field 'transactionManager'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'org.springframework.transaction.PlatformTransactionManager' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    2019-11-12 21:47:42.242  INFO 39624 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Shutting down ExecutorService 'camundaTaskExecutor'
    2019-11-12 21:47:42.242  INFO 39624 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Shutting down ExecutorService 'applicationTaskExecutor'
    2019-11-12 21:47:42.244  INFO 39624 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
    2019-11-12 21:47:42.248 ERROR 39624 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Failed to destroy the filter named [Engines Filter] of type [org.camunda.bpm.spring.boot.starter.webapp.filter.LazyProcessEnginesFilter]
    
    java.lang.NullPointerException: null
        at org.camunda.bpm.spring.boot.starter.webapp.filter.LazyDelegateFilter.destroy(LazyDelegateFilter.java:49) ~[camunda-bpm-spring-boot-starter-webapp-core-3.0.0.jar:3.0.0]
        at org.apache.catalina.core.ApplicationFilterConfig.release(ApplicationFilterConfig.java:301) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.core.StandardContext.filterStop(StandardContext.java:4562) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5380) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:257) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1393) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1382) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_151]
        at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134) [na:1.8.0_151]
        at org.apache.catalina.core.ContainerBase.stopInternal(ContainerBase.java:969) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:257) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1393) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1382) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_151]
        at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134) [na:1.8.0_151]
        at org.apache.catalina.core.ContainerBase.stopInternal(ContainerBase.java:969) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:257) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.core.StandardService.stopInternal(StandardService.java:475) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:257) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.core.StandardServer.stopInternal(StandardServer.java:994) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:257) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.startup.Tomcat.stop(Tomcat.java:465) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.stopTomcat(TomcatWebServer.java:250) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
        at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.stop(TomcatWebServer.java:306) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.stopAndReleaseWebServer(ServletWebServerApplicationContext.java:320) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
        at de.countandcare.carorderprocess.CarorderprocessApplication.main(CarorderprocessApplication.java:14) [classes/:na]
    
    2019-11-12 21:47:42.249 ERROR 39624 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Failed to destroy the filter named [Security Filter] of type [org.camunda.bpm.spring.boot.starter.webapp.filter.LazySecurityFilter]
    
    java.lang.NullPointerException: null
        at org.camunda.bpm.spring.boot.starter.webapp.filter.LazyDelegateFilter.destroy(LazyDelegateFilter.java:49) ~[camunda-bpm-spring-boot-starter-webapp-core-3.0.0.jar:3.0.0]
        at org.apache.catalina.core.ApplicationFilterConfig.release(ApplicationFilterConfig.java:301) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.core.StandardContext.filterStop(StandardContext.java:4562) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5380) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:257) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1393) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1382) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_151]
        at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134) [na:1.8.0_151]
        at org.apache.catalina.core.ContainerBase.stopInternal(ContainerBase.java:969) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:257) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1393) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.core.ContainerBase$StopChild.call(ContainerBase.java:1382) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_151]
        at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134) [na:1.8.0_151]
        at org.apache.catalina.core.ContainerBase.stopInternal(ContainerBase.java:969) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:257) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.core.StandardService.stopInternal(StandardService.java:475) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:257) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.core.StandardServer.stopInternal(StandardServer.java:994) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:257) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.apache.catalina.startup.Tomcat.stop(Tomcat.java:465) [tomcat-embed-core-9.0.19.jar:9.0.19]
        at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.stopTomcat(TomcatWebServer.java:250) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
        at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.stop(TomcatWebServer.java:306) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.stopAndReleaseWebServer(ServletWebServerApplicationContext.java:320) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
        at de.countandcare.carorderprocess.CarorderprocessApplication.main(CarorderprocessApplication.java:14) [classes/:na]
    
    2019-11-12 21:47:42.257  INFO 39624 --- [           main] ConditionEvaluationReportLoggingListener : 
    
    Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
    2019-11-12 21:47:42.316 ERROR 39624 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 
    
    ***************************
    APPLICATION FAILED TO START
    ***************************
    
    Description:
    
    Field transactionManager in org.camunda.bpm.spring.boot.starter.configuration.impl.DefaultDatasourceConfiguration required a bean of type 'org.springframework.transaction.PlatformTransactionManager' that could not be found.
    
    The following candidates were found but could not be injected:
        - Bean method 'transactionManager' in 'DataSourceTransactionManagerAutoConfiguration.DataSourceTransactionManagerConfiguration' not loaded because @ConditionalOnSingleCandidate (types: javax.sql.DataSource; SearchStrategy: all) did not find any beans
    
    
    Action:
    
    Consider revisiting the entries above or defining a bean of type 'org.springframework.transaction.PlatformTransactionManager' in your configuration.
    
    
    Process finished with exit code 1

Why is the error coming? All my maven dependencies are correctly resolved. Also how can I access the Camuna webapp, which shows me my processes/tasks etc...

Answer 1

Please check the version matrix: https://docs.camunda.org/manual/7.11/user-guide/spring-boot-integration/version-compatibility/

You want to use spring boot 2.1.x with the starter 3.0.0 ... but 2.1.x support was only introduced with 3.2 Rule of thumb: use the latest versions ... especially when you start a fresh project. There is a lot going on in spring boot and some hard to maintain (jersey/mybatis) stuff in camunda ... so weird problems may occur when you mix versions.

Answer 2

Based on your stack trace i think you missed the database configuration for your H2 dB.

Please add these props in your application.propeties

spring.datasource.url=jdbc:h2:mem:testdb
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=sa
spring.datasource.password=
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect