How to integrate flowable-form-engine to a spring-boot application

Gustavo_Caldeira · May 26, 2017, 12:33am

Hi Brothers!

I wold like to know how to config my spring-boot-app to work with the flowable-form-engine. I have include the following dependencies:

flowable-spring-boot-starter-jpa
flowable-form-engine
flowable-form-engine-configurator
flowable-form-spring

My Java context looks like:

public class VcDataConfig {

@Autowired
private DataSource dataSource;

@Autowired
private PlatformTransactionManager transactionManager;

@Bean
public SpringFormEngineConfiguration formEngineConfiguration() {

    SpringFormEngineConfiguration configuration = new SpringFormEngineConfiguration();

    configuration.setDataSource(dataSource);
    configuration.setTransactionManager(transactionManager);
    configuration.setDatabaseSchemaUpdate("true");
    configuration.setDeploymentMode("single-resource");

    return configuration;
}

@Bean
public FormEngine formEngine() throws Exception {

    FormEngineFactoryBean formEngineFactoryBean = new FormEngineFactoryBean();
    formEngineFactoryBean.setFormEngineConfiguration(formEngineConfiguration());

    return formEngineFactoryBean.getObject();
}

@Bean
public FormManagementService formManagementService() throws Exception {
    return formEngine().getFormManagementService();
}

@Bean
public FormRepositoryService formRepositoryService() throws Exception {
    return formEngine().getFormRepositoryService();
}

}

When I try to complete a task I’m getting the exception: org.flowable.engine.common.api.FlowableIllegalArgumentException: Form engine is not initialized

Gustavo_Caldeira · May 26, 2017, 2:08am

I found the solution. Is just implement the interface ProcessEngineConfigurationConfigurer in a bean and pass a FormEngineConfigurator to the processEngineConfiguration.

Anyway, thank you.

arpit.agrawal · August 2, 2017, 7:37am

Hi, can you tell me the exact complete process maybe share the code on how to use form-engine and dmn-engine with spring-boot?

joram · August 4, 2017, 12:12pm

It would be something like this (haven’t tried it, but this is the idea):

@Bean
public ProcessEngineConfigurationConfigurer configurationConfigurer() {
    return new ProcessEngineConfigurationConfigurer() {
        public void configure(SpringProcessEngineConfiguration processEngineConfiguration) {
            processEngineConfiguration.addConfigurator(new FormEngineConfigurator());
            processEngineConfiguration.addConfigurator(new DmnEngineConfigurator());
        }
    };
}

arpit.agrawal · August 7, 2017, 6:10am

Hi joram,
thank you for the quick reply. Can you tell me how to integrate form api and dmn api with the spring-boot. I have added these dependencies :

org.flowable flowable-spring-boot-starter-basic 6.1.2

	<dependency>
	    <groupId>org.flowable</groupId>
	    <artifactId>flowable-spring-boot-starter-rest-api</artifactId>
	    <version>6.1.2</version>
	</dependency>
	
	
	<dependency>
	    <groupId>org.flowable</groupId>
	    <artifactId>flowable-form-spring-configurator</artifactId>
	    <version>6.1.2</version>
	</dependency>
	
	
	<dependency>
	    <groupId>org.flowable</groupId>
	    <artifactId>flowable-dmn-spring-configurator</artifactId>
	    <version>6.1.2</version>
	</dependency>
	
	<dependency>
	    <groupId>org.flowable</groupId>
	    <artifactId>flowable-rest</artifactId>
	    <version>6.1.2</version>
	</dependency>
	
	<dependency>
	    <groupId>org.flowable</groupId>
	    <artifactId>flowable-form-rest</artifactId>
	    <version>6.1.2</version>
	</dependency>
	
	<dependency>
	    <groupId>org.flowable</groupId>
	    <artifactId>flowable-form-api</artifactId>
	    <version>6.1.2</version>
	</dependency>

But i am still not able to access : “form-repository/deployments” or any other form api.

joram · August 8, 2017, 7:15pm

Besides the configurators, did you also add the configurationConfigurer bean from above?
If so, the form and dmn engine can be retrieved for example from the DmnEngines lookup class.

fabianyvidal · August 12, 2017, 7:30pm

I have followed the given instructions , I have added the bean ProcessEngineConfigurationConfigurer as suggested by joram ,

@Configuration
public class ProcessEngineConfig {
@Bean
public ProcessEngineConfigurationConfigurer configurationConfigurer() {
return new ProcessEngineConfigurationConfigurer() {
public void configure(SpringProcessEngineConfiguration processEngineConfiguration) {
processEngineConfiguration.addConfigurator(new FormEngineConfigurator());
processEngineConfiguration.addConfigurator(new DmnEngineConfigurator());
}
};
}
}"

Then I added dependencies, but when trying to run the project I got the following error:

" Error creating bean with name ‘org.springframework.boot.autoconfigure.liquibase.LiquibaseAutoConfiguration$LiquibaseConfiguration’: Invocation of init method failed; nested exception is java.lang.IllegalStateException: Cannot find changelog location: class path resource [db/changelog/db.changelog-master.yaml] (please add changelog or check your Liquibase configuration)"

I think it is the same error reported at:
https://forum.flowable.org/t/adding-form-engine-and-dmn-engine-in-spring-boot/799

those are the dependencies I have in my pom.xml

	<dependency>
		<groupId>org.flowable</groupId>
		<artifactId>flowable-spring-boot-starter-rest-api</artifactId>
		<version>${flowable.version}</version>
	</dependency>

	<dependency>
		<groupId>org.flowable</groupId>
		<artifactId>flowable-spring-boot-starter-jpa</artifactId>
		<version>${flowable.version}</version>
	</dependency>

	<dependency>
		<groupId>org.flowable</groupId>
		<artifactId>flowable-form-spring-configurator</artifactId>
		<version>${flowable.version}</version>
	</dependency>


	<dependency>
		<groupId>org.flowable</groupId>
		<artifactId>flowable-dmn-spring-configurator</artifactId>
		<version>${flowable.version}</version>
	</dependency>
	

	<dependency>
		<groupId>org.flowable</groupId>
		<artifactId>flowable-form-rest</artifactId>
		<version>${flowable.version}</version>
	</dependency>

	<dependency>
		<groupId>org.flowable</groupId>
		<artifactId>flowable-form-api</artifactId>
		<version>${flowable.version}</version>
	</dependency>

what am i doing wrong?, thanks in advance!!!

arpit.agrawal · August 14, 2017, 7:14am

Hi Joram,

@Bean
public SpringDmnEngineConfiguration dmnEngineConfigure() {
	SpringDmnEngineConfiguration sdec = new SpringDmnEngineConfiguration();
	sdec.setDataSource(dataSource);
	sdec.setTransactionManager(transactionManager);
	sdec.setDatabaseSchemaUpdate("true");
	sdec.setDeploymentMode("single-resource");
	return sdec;
}

@Bean
public DmnEngineConfigurator dmnEngineConfigurator() {
	DmnEngineConfigurator dec = new DmnEngineConfigurator();
	dec.setDmnEngineConfiguration(dmnEngineConfigure());
	return dec;
}

@Bean
public DmnEngine getDmnEngine(SpringDmnEngineConfiguration sdec) {
	return sdec.buildDmnEngine();
}

@Bean
public SpringFormEngineConfiguration formEngineConfigure() {
	SpringFormEngineConfiguration sfec = new SpringFormEngineConfiguration();
	sfec.setDataSource(dataSource);
	sfec.setTransactionManager(transactionManager);
	sfec.setDatabaseSchemaUpdate("true");
	sfec.setDeploymentMode("single-resource");
	return sfec;
}

@Bean
public FormEngineConfigurator formEngineConfigurator() {
	FormEngineConfigurator dec = new FormEngineConfigurator();
	dec.setFormEngineConfiguration(formEngineConfigure());
	return dec;
}

@Bean
public FormEngine getFormEngine(SpringFormEngineConfiguration sfec) {
	return sfec.buildFormEngine();
}

@Bean
public FormRepositoryService getFormRepositoryService(SpringFormEngineConfiguration sfec) {
	return getFormEngine(sfec).getFormRepositoryService();
}

@Bean
public BeanPostProcessor activitiConfigurer() {
	return new BeanPostProcessor() {
		@Override
		public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
			if (bean instanceof SpringProcessEngineConfiguration) {
				List<ProcessEngineConfigurator> config = new ArrayList<ProcessEngineConfigurator>();
				config.add(dmnEngineConfigurator());
				config.add(formEngineConfigurator());
				((SpringProcessEngineConfiguration) bean).setConfigurators(config);
			}
			return bean;
		}

		@Override
		public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
			return bean;
		}
	};
}

This is the code i am using. Is their anything i am missing?
Here i am talking about Rest API for form and DMN which are not working.

Thank You,

arpit.agrawal · August 14, 2017, 7:19am

HI,

I dont know how correct or wrong this solution is, but for me this works. i added

<?xml version="1.0" encoding="UTF-8"?> 
<databaseChangeLog
  xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog
                      http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.1.xsd">
 
</databaseChangeLog>

this to a file named “db.changelog-master.xml” and put this file into resources/db/changelog. It worked but i am not sure if this is the correct way to do it. I am also exploring things.

Vzy · October 12, 2017, 4:09pm

If i working on tomcat server, do i need to change any file? and form that i created in “flowable-modeler” is not reflecting in “flowable-admin” of Form Engine Deployments

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How to integrate flowable-form-engine to a spring-boot application

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