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Chapter 5. Red Hat Process Automation Manager Spring Boot configuration
After you create your Spring Boot project, you can configure several components to customize your application.
5.1. Configuring REST endpoints for Spring Boot applications
After you create your Spring Boot project, you can configure the host, port, and path for the REST endpoint for your Spring Boot application.
Prerequisites
- You have a ZIP file that you created using the business application website.
Procedure
-
Extract the Spring Boot project ZIP file and navigate to the
<BUSINESS-APPLICATION>/<BUSINESS-APPLICATION>-service/src/main/resources
folder, where<BUSINESS-APPLICATION>
is the name of your Spring Boot project. -
Open the
application.properties
file in a text editor. Configure the host, port, and path for the REST endpoints, where
<ADDRESS>
is the server address and<PORT>
is the server port:server.address=<ADDRESS> server.port=<PORT> cxf.path=/rest
The following example adds the REST endpoint to the address
localhost
on port8090
.server.address=localhost server.port=8090 cxf.path=/rest
5.2. Configuring the KIE Server identity
After you create your Spring Boot project, you can configure KIE Server so that it can be easily identified.
Prerequisites
- You have a Spring Boot business application ZIP file that you created using the business application website.
Procedure
-
Extract the Spring Boot project ZIP file and navigate to the
<BUSINESS-APPLICATION>/<BUSINESS-APPLICATION>-service/src/main/resources
folder, where<BUSINESS-APPLICATION>
is the name of your Spring Boot project. -
Open the
application.properties
file in a text editor. Configure the KIE Server parameters as shown in the following example:
kieserver.serverId=<BUSINESS-APPLICATION>-service kieserver.serverName=<BUSINESS-APPLICATION>-service kieserver.location=http://localhost:8090/rest/server kieserver.controllers=http://localhost:8080/business-central/rest/controller
The following table describes the KIE Server parameters that you can configure in your business project:
Table 5.1. kieserver parameters Parameter Values Description kieserver.serverId
string
The ID used to identify the business application when connecting to the Process Automation Manager controller.
kieserver.serverName
string
The name used to identify the business application when it connects to the Process Automation Manager controller. Can be the same string used for the
kieserver.serverId
parameter.kieserver.location
URL
Used by other components that use the REST API to identify the location of this server. Do not use the location as defined by
server.address
andserver.port
.kieserver.controllers
URLs
A comma-separated list of controller URLs.
5.3. Integrating Apache Kafka with your Red Hat Process Automation Manager Spring Boot project
Apache Kafka is a distributed data streaming platform that can publish, subscribe to, store, and process streams of records in real time. It is designed to handle data streams from multiple sources and deliver them to multiple consumers. Apache Kafka is an alternative to a traditional enterprise messaging system.
You can integrate Apache Kafka with your Red Hat Process Automation Manager Spring Boot project.
Prerequisites
- You have an existing Red Hat Process Automation Manager Spring Boot project.
Procedure
-
In your Spring Boot project directory, open the
business-application-service/src/main/resources/application.properties
file. Add the
kieserver.kafka.enabled
system property with valuetrue
:kieserver.kafka.enabled=true
Additional resources
5.4. Configuring KIE Server components to start at runtime
If you selected Business Automation when you created your Spring Boot business application, you can specify which KIE Server components must start at runtime.
Prerequisites
- You have a Spring Boot business application ZIP file that you created using the business application website.
Procedure
-
Extract the Spring Boot project ZIP file and navigate to the
<BUSINESS-APPLICATION>/<BUSINESS-APPLICATION>-service/src/main/resources
folder, where<BUSINESS-APPLICATION>
is the name of your Spring Boot project. -
Open the
application.properties
file in a text editor. To set a component to start at runtime, set the value of the component to
true.
The following table lists the components that you can set to start at runtime:
Table 5.2. kieserver capabilities parameters Parameter Values Description kieserver.drools.enabled
true, false
Enables or disables the Decision Manager component.
kieserver.dmn.enabled
true, false
Enables or disables the Decision Model and Notation (DMN) component.
kieserver.jbpm.enabled
true, false
Enables or disables the Red Hat Process Automation Manager component.
kieserver.jbpmui.enabled
true, false
Enables or disables the Red Hat Process Automation Manager UI component.
kieserver.casemgmt.enabled
true, false
Enables or disables the case management component.
5.5. Configuring your Spring Boot application for asynchronous execution
After you create your Spring Boot project, you can use the jbpm.executor
parameters to enable asynchronous execution.
Prerequisites
- You have a Spring Boot business application ZIP file that you created using the business application website.
Procedure
-
Extract the Spring Boot project ZIP file and navigate to the
<BUSINESS-APPLICATION>/<BUSINESS-APPLICATION>-service/src/main/resources
folder, where<BUSINESS-APPLICATION>
is the name of your Spring Boot project. -
Open the
application.properties
file in a text editor. To enable asynchronous execution, set the value of the
jbpm.executor.enabled
parameter totrue
, uncomment the otherjbpm.executor
parameters, and change the values as required, as shown in the following example:jbpm.executor.enabled=true jbpm.executor.retries=5 jbpm.executor.interval=0 jbpm.executor.threadPoolSize=1 jbpm.executor.timeUnit=SECONDS
The following table describes the executor parameters that you can configure in your business project:
Table 5.3. Executor parameters Parameter Values Description jbpm.executor.enabled
true, false
Disables or enables the executor component.
jbpm.executor.retries
integer
Specifies the number of retries if errors occur while a job is running.
jbpm.executor.interval
integer
Specifies the length of time that the executor uses to synchronize with the database. The unit of time is specified by the
jbpm.executor.timeUnit
parameter. Disabled by default (value0
).jbpm.executor.threadPoolSize
integer
Specifies the thread pool size.
jbpm.executor.timeUnit
string
Specifies the time unit used to calculate the interval that the executor uses to synchronize with the database. The value must be a valid constant of
java.util.concurrent.TimeUnit
. The default value isSECONDS
.
5.6. Configuring the business application for a cluster using Quartz
If you plan to run your application in a cluster, you must configure the Quartz timer service.
Prerequisites
- You have a ZIP file that you created using the business application website, that you want to use in a cluster.
Procedure
Create the
quartz.properties
file and add the following content:#============================================================================ # Configure Main Scheduler Properties #============================================================================ org.quartz.scheduler.instanceName = SpringBootScheduler org.quartz.scheduler.instanceId = AUTO org.quartz.scheduler.skipUpdateCheck=true org.quartz.scheduler.idleWaitTime=1000 #============================================================================ # Configure ThreadPool #============================================================================ org.quartz.threadPool.class = org.quartz.simpl.SimpleThreadPool org.quartz.threadPool.threadCount = 5 org.quartz.threadPool.threadPriority = 5 #============================================================================ # Configure JobStore #============================================================================ org.quartz.jobStore.misfireThreshold = 60000 org.quartz.jobStore.class=org.quartz.impl.jdbcjobstore.JobStoreCMT org.quartz.jobStore.driverDelegateClass=org.jbpm.process.core.timer.impl.quartz.DeploymentsAwareStdJDBCDelegate org.quartz.jobStore.useProperties=false org.quartz.jobStore.dataSource=myDS org.quartz.jobStore.nonManagedTXDataSource=notManagedDS org.quartz.jobStore.tablePrefix=QRTZ_ org.quartz.jobStore.isClustered=true org.quartz.jobStore.clusterCheckinInterval = 5000 #============================================================================ # Configure Datasources #============================================================================ org.quartz.dataSource.myDS.connectionProvider.class=org.jbpm.springboot.quartz.SpringConnectionProvider org.quartz.dataSource.myDS.dataSourceName=quartzDataSource org.quartz.dataSource.notManagedDS.connectionProvider.class=org.jbpm.springboot.quartz.SpringConnectionProvider org.quartz.dataSource.notManagedDS.dataSourceName=quartzNotManagedDataSource
NoteData source names in the Quartz configuration file refer to Spring beans. The connection provider must be set to
org.jbpm.springboot.quartz.SpringConnectionProvider
to enable integration with Spring-based data sources.To enable the Quartz clustered timers and set the path of the
quartz.properties
file that you created in the previous step, include the following properties in the<BUSINESS-APPLICATION>/<BUSINESS-APPLICATION>-service/src/main/resourcesapplication.properties
file, where<BUSINESS-APPLICATION>
is the name of your Spring Boot project.jbpm.quartz.enabled=true jbpm.quartz.configuration=quartz.properties
Create a managed and an unmanaged data source by adding the following content to the
<BUSINESS-APPLICATION>/<BUSINESS-APPLICATION>-service/src/main/resources/application.properties
file:# enable to use database as storage jbpm.quartz.db=true quartz.datasource.name=quartz quartz.datasource.username=sa quartz.datasource.password=sa quartz.datasource.url=jdbc:h2:./target/spring-boot-jbpm;MVCC=true quartz.datasource.driver-class-name=org.h2.Driver # used to configure connection pool quartz.datasource.dbcp2.maxTotal=15 # used to initialize quartz schema quartz.datasource.initialization=true spring.datasource.schema=classpath*:<QUARTZ_TABLES_H2>.sql spring.datasource.initialization-mode=always
In the preceding example, replace
<QUARTZ_TABLES_H2>
with the name of a Quartz H2 database schema script. The last three lines of the preceding configuration initialize the database schema.
By default, Quartz requires two data sources:
- Managed data source to participate in the transaction of the decision engine or process engine
- Unmanaged data source to look up timers to trigger without any transaction handling
Red Hat Process Automation Manager business applications assume that the Quartz database (schema) will be co-located with Red Hat Process Automation Manager tables and therefore produce data sources used for transactional operations for Quartz.
The other (non transactional) data source must be configured but it should point to the same database as the main data source.
5.7. Configuring business application user group providers
With Red Hat Process Automation Manager, you can manage human-centric activities. To provide integration with user and group repositories, you can use two KIE API entry points:
-
UserGroupCallback
: Responsible for verifying whether a user or group exists and for collecting groups for a specific user -
UserInfo
: Responsible for collecting additional information about users and groups, for example email addresses and preferred language
You can configure both of these components by providing alternative code, either code provided out of the box or custom developed code.
For the UserGroupCallback
component, retain the default implementation because it is based on the security context of the application. For this reason, it does not matter which backend store is used for authentication and authorisation (for example, RH-SSO). It will be automatically used as a source of information for collecting user and group information.
The UserInfo
component is a separate component because it collects more advanced information.
Prerequisites
- You have a ZIP file that you created using the business application website and that contains a business automation project.
Procedure
To provide an alternative implementation of
UserGroupCallback
, add the following code to the Application class or a separate class annotated with@Configuration
:@Bean(name = "userGroupCallback") public UserGroupCallback userGroupCallback(IdentityProvider identityProvider) throws IOException { return new MyCustomUserGroupCallback(identityProvider); }
To provide an alternative implementation of
UserInfo
, add the following code to the Application class or a separate class annotated with@Configuration
:@Bean(name = "userInfo") public UserInfo userInfo() throws IOException { return new MyCustomUserInfo(); }
5.8. Configuring a Spring Boot project with a MySQL or PostgreSQL database
Red Hat Process Automation Manager business applications are generated with the default H2 database. You can change the database type to MySQL or PostgreSQL.
Prerequisites
- You have a Spring Boot application file that you created using the business applications website.
Procedure
-
Extract the Spring Boot project ZIP file and navigate to the
<BUSINESS-APPLICATION>/<BUSINESS-APPLICATION>-service/src/main/resources
folder, where<BUSINESS-APPLICATION>
is the name of your Spring Boot project. -
Open the
application.properties
file in a text editor. Configure your Spring Boot project to use a MySQL or PostgreSQL, complete one of the following set of steps:
To configure your business application to use a MySQL database, locate the following parameters in the
application.properties
file and change the values as shown:spring.datasource.username=jbpm spring.datasource.password=jbpm spring.datasource.url=jdbc:mysql://localhost:3306/jbpm spring.datasource.driver-class-name=com.mysql.jdbc.jdbc2.optional.MysqlXADataSource spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5InnoDBDialect
To configure your business application to use a PostgreSQL database, locate the following parameters in the
application.properties
file and change the values as shown:spring.datasource.username=jbpm spring.datasource.password=jbpm spring.datasource.url=jdbc:postgresql://localhost:5432/jbpm spring.datasource.driver-class-name=org.postgresql.xa.PGXADataSource spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.PostgreSQLDialect
NoteTo create a PostgreSQL schema that uses the
bytea
column type instead of theoid
column type, set the value of theorg.kie.persistence.postgresql.useBytea
property totrue
:org.kie.persistence.postgresql.useBytea=true
-
Save the
application.properties
file.
5.9. Configuring business applications for JPA
The Java Persistence API (JPA) is a standard technology that enables you to map objects to relational databases. You must configure JPA for your Red Hat Process Automation Manager business application.
Prerequisites
- You have a ZIP file that you created using the business applications website.
Procedure
-
Extract the
<BUSINESS-APPLICATION>.zip
file and navigate to the<BUSINESS-APPLICATION>/<BUSINESS-APPLICATION>-service/src/main/resources
folder, where<BUSINESS-APPLICATION>
is the name of your Spring Boot project. -
Open the
application.properties
file in a text editor. Locate the following parameters in the
application.properties
file and verify that they have the values shown:spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.H2Dialect spring.jpa.properties.hibernate.show_sql=false spring.jpa.properties.hibernate.hbm2ddl.auto=update spring.jpa.hibernate.naming.physical-strategy=org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl
If your business application has business automation capabilities, you can add entities to the entity manager factory by adding a comma-separated list of packages:
spring.jpa.properties.entity-scan-packages=org.jbpm.springboot.samples.entities
Business applications with business automation capabilities create an entity manager factory based on the
persistence.xml
file that comes with Red Hat Process Automation Manager. All entities found in theorg.jbpm.springboot.samples.entities
package are automatically added to the entity manager factory and used the same as any other JPA entity in the application.
Additional resources
For more information about configuring JPA, see the Spring Boot Reference Guide.
5.10. Configuring pluggable variable persistence
You can provide an arbitrary entity manager for configured process variable persistence in your Red Hat Process Automation Manager Spring Boot application. To do this, add named beans during the object marshalling strategy resolution. This enables you to configure a second entity manager factory based on a second data source qualifier. Note that this configuration will not interfere with the primary data source.
Prerequisites
- You have an existing Red Hat Process Automation Manager Spring Boot project.
Procedure
Add a customized entity manager JavaBean to your java class. The following example shows an entity manager Java Bean called
auditEntityManager
for a Java Persistence API (JPA) data source:@Bean(name = "auditEntityManager") @ConditionalOnMissingBean(name = "auditEntityManager") public LocalContainerEntityManagerFactoryBean entityManagerFactory(@Qualifier("jpaAuditDataSource") DataSource dataSource, JpaProperties jpaProperties) { return EntityManagerFactoryHelper.create(applicationContext, dataSource, jpaProperties, "custom-persistent-unit", "classpath:/META-INF/persistence.xml"); }
The
auditEntityManager
becomes an implicit context parameter when the parameters are resolved during MVFLEX Expression Language (MVEL) evaluation.Add the following marshalling stragegy to the
kie-deployment-descriptor.xml
file:<marshalling-strategy> <resolver>mvel</resolver> <identifier>new org.drools.persistence.jpa.marshaller.JPAPlaceholderResolverStrategy(auditEntityManager) </identifier> <parameters/> </marshalling-strategy>
Additional resources
- For more information about persistence, see the "Persisting process variables in a separate database schema in Red Hat Process Automation Manager" section in Managing and monitoring KIE Server.
5.11. Enabling Swagger documentation
You can enable Swagger-based documentation for all endpoints available in the service project of your Red Hat Process Automation Manager business application.
Prerequisites
- You have a Spring Boot application ZIP file that you created using the business applications website.
Procedure
-
Extract the
<BUSINESS-APPLICATION>.zip
file and navigate to the<BUSINESS-APPLICATION>/<BUSINESS-APPLICATION>-service
folder, where<BUSINESS-APPLICATION>
is the name of your Spring Boot project. -
Open the service project
pom.xml
file in a text editor. Add the following dependencies to the service project
pom.xml
file and save the file.<dependency> <groupId>org.apache.cxf</groupId> <artifactId>cxf-rt-rs-service-description-swagger</artifactId> <version>3.2.6</version> </dependency> <dependency> <groupId>io.swagger</groupId> <artifactId>swagger-jaxrs</artifactId> <version>1.5.15</version> <exclusions> <exclusion> <groupId>javax.ws.rs</groupId> <artifactId>jsr311-api</artifactId> </exclusion> </exclusions> </dependency>
To enable the Swagger UI (optional), add the following dependency to the
pom.xml
file and save the file.<dependency> <groupId>org.webjars</groupId> <artifactId>swagger-ui</artifactId> <version>2.2.10</version> </dependency>
-
Open the
<BUSINESS-APPLICATION>/<BUSINESS-APPLICATION>-service/src/main/resources/application.properties
file in a text editor. Add the following line to the
application.properties
file to enable Swagger support:kieserver.swagger.enabled=true
After you start the business application, you can view the Swagger document at http://localhost:8090/rest/swagger.json
. The complete set of endpoints is available at http://localhost:8090/rest/api-docs?url=http://localhost:8090/rest/swagger.json
.