Develop Reference

Schedule Task with Jax-RS and CDI

I'm try to understand how to manage scheduled tasks in my project with Jax-RS and CDI.
With Spring I was easily able to achive that with ThreadPoolTaskScheduler or #Scheduled annotation and I'm trying to replicate both ways without success.
First of all, I'm using Wildfly 14 and this seems to cause some issues because I've tryied to inject with #Resource both ManagedScheduledExecutorService and TimerService but Wildfly throws exception of missing dependencies (but the Admin guide didn't help me about that).
Instead of inject resources I've tryied to use a singleton object like this:
#Singleton
public class CacheManager {
private final static Logger log = LogManager.getLogger();
public CacheManager() {
log.error("######## Init" + LocalTime.now());
}
#Schedule(hour = "*", minute = "*", second = "*/1")
private void timeout() {
log.error("######## " + LocalTime.now());
}
}
But the method is never called.
So I'm not understanding what I'm missing. Maybe I have wrongly configured the project so this is my pom.xml dependencies:
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.2</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.10.2</version>
</dependency>
<!-- Import the JAX-RS API, we use provided scope as the API is included in JBoss WildFly -->
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxrs</artifactId>
<version>3.10.0.Final</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>jaxrs-api</artifactId>
<version>3.0.12.Final</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-multipart-provider</artifactId>
<version>3.0.12.Final</version>
<scope>provided</scope>
</dependency>
<!-- Import the CDI API, we use provided scope as the API is included in JBoss WildFly -->
<dependency>
<groupId>javax.enterprise</groupId>
<artifactId>cdi-api</artifactId>
<version>2.0</version>
<scope>provided</scope>
</dependency>
<!-- Import the JSF API, we use provided scope as the API is included in JBoss WildFly -->
<dependency>
<groupId>org.jboss.spec.javax.faces</groupId>
<artifactId>jboss-jsf-api_2.2_spec</artifactId>
<version>2.2.14</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.11.2</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.11.2</version>
</dependency>
<dependency>
<groupId>javax.ejb</groupId>
<artifactId>ejb-api</artifactId>
<version>3.0</version>
<scope>provided</scope>
</dependency>
</dependencies>
This is my beans.xml
<beans xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=" http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/beans_1_1.xsd" bean-discovery-mode="annotated">
</beans>
I am using Java 8.
EDIT: the CacheManager is instantiated in the JAX-WS Application
#ApplicationScoped
#ApplicationPath("/rest")
public class JaxRsActivator extends Application {
private static final Logger logger = LogManager.getLogger();
private Set<Object> singletons = new HashSet<Object>();
private HashSet<Class<?>> classes = new HashSet<Class<?>>();
public JaxRsActivator() {
singletons.add(new CorsFilter());
singletons.add(new CacheManager());
}
#Override
public Set<Object> getSingletons() {
return singletons;
}
#Override
public HashSet<Class<?>> getClasses(){
return classes;
}
}

I've found the solutions: #Singleton must be javax.ejb.Singleton and not javax.inject.Singleton.

SseEmitter onError method behaves different in Tomcat and Glassfish/Payara

I'm implementing server sent events in Spring MVC application with Payara 5. However, when there is error on emitter.send() (when client disconnected) emitter's onError method doesn't get called. When I try the same code on Spring Boot with embedded Tomcat everything works normal. Spring dependency versions are same on both applications.
#GetMapping("/listen-sse")
public SseEmitter sseEmitter() {
SseEmitter emitter = new SseEmitter(0L);
emitter.onError(e -> System.out.println("OnError"));
ExecutorService service = Executors.newCachedThreadPool();
service.execute(() -> {
while (true) {
try {
Thread.sleep(2000);
emitter.send("Hello");
} catch (IOException | InterruptedException e) {
System.out.println("Exception");
break;
}
}
});
service.shutdown();
return emitter;
}
My dependencies in Spring MVC application:
<dependencies>
<!--Spring resources-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>5.1.8.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.1.8.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>5.1.8.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>5.1.8.RELEASE</version>
</dependency>
<!-- Spring + aspects -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>5.1.8.RELEASE</version>
</dependency>
</dependencies>

Spring boot + hikari - dataSource or dataSourceClassName or jdbcUrl is required issue

I get the following error trying to start my Spring application
ERROR 5908 --- [ main] com.zaxxer.hikari.HikariConfig : HikariPool-1 - dataSource or dataSourceClassName or jdbcUrl is required.
My application.properties file looks like this:
spring.datasource.one.jdbc-url = jdbc:postgresql://10.x.x.x:y/sampledb1
spring.datasource.one.username = someuser
spring.datasource.one.password = somepasswd
spring.datasource.one.driver-class-name = org.postgresql.Driver
spring.datasource.two.jdbc-url = jdbc:postgresql://10.x.x.x:z/sampledb2
spring.datasource.two.username = someuser
spring.datasource.two.password = somepassword
spring.datasource.two.driver-class-name = org.postgresql.Driver
And I am using DataSourceBuilder class as below:
#Configuration
public class DataSourceConfig
{
#Bean(name = "one")
#Primary
#ConfigurationProperties(prefix = "spring.datasource.one")
public DataSource dataSource1()
{
return DataSourceBuilder.create().build();
}
#Bean(name = "two")
#ConfigurationProperties(prefix = "spring.datasource.two")
public DataSource dataSource2()
{
return DataSourceBuilder.create().build();
}
}
My pom looks like this.
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.4.RELEASE</version>
<relativePath />
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java.version>1.8</java.version>
<avro.version>1.8.2</avro.version>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<version.powermock>1.6.2</version.powermock>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<artifactId>log4j-over-slf4j</artifactId>
<groupId>org.slf4j</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- actuator -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<!-- eureka -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<!-- hystrix -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
</dependency>
</dependencies>
This was working fine earlier, but now causing some issues. And the error occurs intermittently, sometime it starts without error, other times it fails with the error.
I tried solutions suggested in the link .They don't seem to work for me.

Change jdbc-url to jdbcUrl so Hikari can find suitable driver per url.
jdbcUrl
This property directs HikariCP to use "DriverManager-based" configuration. We feel that DataSource-based configuration (above) is superior for a variety of reasons (see below), but for many deployments there is little significant difference. When using this property with "old" drivers, you may also need to set the driverClassName property, but try it first without. Note that if this property is used, you may still use DataSource properties to configure your driver and is in fact recommended over driver parameters specified in the URL itself. Default: none

This error can occur when spring looks for the properties file at the wrong location. For example, when the Java option -Dspring.config.location=... is passed to your application server at startup then your properties file of your deployed application is ignored - even if there is no properties file at spring.config.location, too.

Camel context not starting in hello world app

I am attempting to run camel within spring. Below are the files i have..
POM xml file which have relevant dependencies.
<properties>
<spring.version>3.2.11.RELEASE</spring.version>
<camel.version>2.14.1</camel.version>
</properties>
<?xml version="1.0" encoding="UTF-8"?>
<dependencies>
<!-- camel core -->
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-core</artifactId>
<version>${camel.version}</version>
</dependency>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-spring</artifactId>
<version>${camel.version}</version>
</dependency>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-metrics</artifactId>
<version>${camel-version}</version>
</dependency>
<!-- Spring 3 dependencies -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
</dependencies>
Main context file (main-context.xml).
<camel:camelContext trace="false" id="mc-service-camel-context" threadNamePattern="Camel (#camelId#) thread ##counter# - #name#">
<camel:contextScan/>
</camel:camelContext>
A route that looks like this
#Component
public class MyRoute extends RouteBuilder {
#Override
public void configure() throws Exception {
from("timer://runOnce?repeatCount=1&delay=5000")
.log("Hello World!!")
.end();
}
}
And finally a main class that looks like this.
public static void main(String[] args) throws InterruptedException {
AbstractXmlApplicationContext appContext = new ClassPathXmlApplicationContext("main-context.xml");
Thread.sleep(100000);
}
Issue is i don't see the log "Hello World". Could someone give me some feedback on what i am missing..

I had to enable Component scanning.
<context:annotation-config/>
<context:component-scan base-package="com.mycompany.app*" />

Spring 3 with Drools 6 maven inconcistency

I have a problem integrating Drools with Spring. I am trying to make a simple Hello World spring example, I reached a moment where my simple project refuses to compile.
To work with Drools annotations like #KSession I need the drools-spring package, but it seems incompatible with Spring 3. As builder I use Maven. Here is how my .pom's looks like:
<dependencies>
<!-- Drools -->
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-compiler</artifactId>
<version>6.0.0.Final</version>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-core</artifactId>
<version>6.0.0.Final</version>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-decisiontables</artifactId>
<version>6.0.0.Final</version>
</dependency>
<dependency>
<groupId>org.kie</groupId>
<artifactId>kie-api</artifactId>
<version>6.0.0.Final</version>
</dependency>
<dependency>
<groupId>org.kie</groupId>
<artifactId>kie-internal</artifactId>
<version>6.0.0.Final</version>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-spring</artifactId>
<version>6.0.0.Beta2</version>
</dependency>
<!-- Inject -->
<dependency>
<groupId>javax.inject</groupId>
<artifactId>javax.inject</artifactId>
<version>1</version>
</dependency>
<!-- Spring 3 dependencies -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>3.2.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>3.2.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>3.2.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>3.2.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>3.2.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>3.2.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>3.2.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>3.2.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>3.2.4.RELEASE</version>
</dependency>
</dependencies>
I use very simple case of controller class:
#Controller
#RequestMapping(value = "/")
public class BaseController extends AbstractController {
private static final Logger log = Logger.getLogger(BaseController.class);
#Autowired
#KSession("ksession-rules")
KieSession mySession;
#RequestMapping(value = "/test")
public #ResponseBody
String test() {
Fact myFact = new Fact();
myFact.setFactNumber(20); //According to my rule when myFact.number>20
//then result will be set to "Hello World"
mySession.insert(myFact);
mySession.fireAllRules();
return myFact.getResult();
}
}
At this point I receive an error:
"The hierarchy of the type BaseController is inconsistent".
I noticed that if I remove drools-spring from the dependency list the project compiles successfully. However without that package I cannot deploy my project, because the deployer demands the drools' class responsible for interpreting #KSession and that class is located in drools-spring package.
After some investigation it appears that my Drools session configuration seems to have
nothing to do with the error above, so for the sake of succinctness I will not quote them. Instead of that I will mark that even if I don't make any modifications to the spring configuration and remove the KieSession from my example, making it a simple spring hello world example, I receive one and the same error out of my IDE (Eclipse): "The hierarchy of the type BaseController is inconsistent" and if I remove the drools-spring dependency the problem disappears.
It seems to me as dependency conflict.
Does anyone experienced similar problems with drools+spring?
Can someone suggest a solution to the problem?
Am I doing something wrong?
Thanks for the help!

After some research I found two things.
Drools' drools-spring package declares its own spring dependencies that are overriding my spring dependencies, which leads to spring malunctions. What I did is to manually remove the spring dependencies from drools-spring .pom file.
Another mistake that I had in the upper example is that I didn't have kie-spring as dependency. Kie-spring is mandatory for one drools bean KModuleBeanFactoryPostProcessor, which is responsible to read my kmodule-kbase-ksession configuration from the spring configuration.
After resolving these two problems my project compiles now and I can see in the code that KModuleBeanFactoryPostProcessor defines that my configuration is being read and analized as I expected it to be.