Kohei Nozaki's blog 

Environment

• jBeret 1.0.1Beta-SNAPSHOT
• WildFly 8.0.0.Final

Why need it?

• Logger injection through CDI is easy and useful, but for jBatch programming of some occasions, I guess that Job-wide Logger is better than typical class-wide logger. thus, I will try it this time.
• With CDI, we can reduce some annoying code, even related to Job Properties so I also will try to inject a job-level property to a Batchlet through Producer.

Sample project

• jBatch resources
  • jobwideproducer.xml
  • InjectBatchlet.java
• CDI resources
  • JobWideArtifactProducer.java
  • JobLogger.java
  • BaseDate.java
• Test class
  • JobWideProducerJobTest.java

How does it work?

• 2 Injections are declared in InjectBatchlet.
• Both of them will be produced by JobWideArtifactProducer.
• JobWideArtifactProducer creates:
  • a logger. the name contains job name.
  • a Date. it came from job-level property named “baseDate”.

Log

18:14:51,064 INFO  [job.jobwideproducer] (batch-batch - 3) process(): baseDate=14/02/25 0:00

Remarks

• Injection of variables such as working directory of the job may be useful too.

References

1. [Java] CDI - Slf4j Logger Producer
2. SimpleDateFormat (Java Platform SE 6)

Environment

• WildFly8.0.0.Final
• Oracle JDK7u51

Resources

pom.xml

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>org.nailedtothex</groupId>
    <artifactId>ejbtimer</artifactId>
    <version>0.0.1-SNAPSHOT</version>
     <packaging>ejb</packaging>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-api</artifactId>
            <version>7.0</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>

</project>

TimerService.java

package org.nailedtothex.ejbtimer;

import javax.ejb.Schedule;
import javax.ejb.Singleton;

@Singleton
public class TimerService {

    @Schedule(second = "*/1", minute = "*", hour = "*", persistent = false)
    public void periodic() {
        System.out.println("period");
    }

    @Schedule(dayOfMonth = "25", hour = "16", minute = "10", persistent = false)
    public void schedule() {
        System.out.println("schedule");
    }
}

• Almost all of the code was taken from [1].
• There are some additional useful informations and conversations so I recommend to visit [1].
• According to [2], “persistent” attribute means whether timers that missed should fire or not during downtime of the application server.
  • Default is true.
  • I don't want many missed timers to fire at once when I launch the application server which stopped unexpectedly so I just set it false.
• Detail of specification of @Schedule here: [4]

Log

16:09:44,002 INFO  [stdout] (EJB default - 8) period
16:09:45,001 INFO  [stdout] (EJB default - 9) period
16:09:46,002 INFO  [stdout] (EJB default - 10) period
16:09:47,002 INFO  [stdout] (EJB default - 1) period
16:09:48,002 INFO  [stdout] (EJB default - 2) period
16:09:49,002 INFO  [stdout] (EJB default - 4) period
16:09:50,002 INFO  [stdout] (EJB default - 3) period
16:09:51,002 INFO  [stdout] (EJB default - 5) period
16:09:52,002 INFO  [stdout] (EJB default - 6) period
16:09:53,002 INFO  [stdout] (EJB default - 7) period
16:09:54,002 INFO  [stdout] (EJB default - 8) period
16:09:55,002 INFO  [stdout] (EJB default - 9) period
16:09:56,001 INFO  [stdout] (EJB default - 10) period
16:09:57,001 INFO  [stdout] (EJB default - 1) period
16:09:58,001 INFO  [stdout] (EJB default - 2) period
16:09:59,002 INFO  [stdout] (EJB default - 4) period
16:10:00,002 INFO  [stdout] (EJB default - 5) period
16:10:00,003 INFO  [stdout] (EJB default - 3) schedule
16:10:01,001 INFO  [stdout] (EJB default - 6) period
16:10:02,002 INFO  [stdout] (EJB default - 7) period
16:10:03,001 INFO  [stdout] (EJB default - 8) period
16:10:04,001 INFO  [stdout] (EJB default - 9) period
16:10:05,001 INFO  [stdout] (EJB default - 10) period
16:10:06,002 INFO  [stdout] (EJB default - 1) period
16:10:07,003 INFO  [stdout] (EJB default - 2) period

References

1. Simplest Possible EJB 3.1 Timer : Adam Bien's Weblog
2. ejb 3.0 - EJB3 + JEE6: What is a persistent Timer? - Stack Overflow
3. MaestroDev | Building an EJB Project
4. Schedule (Java™ EE 7 Specification APIs)

Environment

• Apache Maven 3.1.1

Common goals

clean

• Delete everything at target directory

compile

• Compile sources to class files

test

• Run JUnit test classes

package

• Make the JAR file or WAR file

install

• It does “package” goal and install the package to local repository so that other Maven project can reference it.

Execute Main class

mvn exec:java -Dexec.mainClass=org.sonatype.mavenbook.weather.Main -Dexec.args="70112"

Show dependencies

Command

mvn dependency:resolve

What will we got

[INFO] The following files have been resolved:
[INFO]    com.ibm.icu:icu4j:jar:2.6.1:compile
[INFO]    xml-apis:xml-apis:jar:1.0.b2:compile
[INFO]    xerces:xmlParserAPIs:jar:2.6.2:compile
[INFO]    oro:oro:jar:2.0.8:compile
[INFO]    log4j:log4j:jar:1.2.14:compile
[INFO]    velocity:velocity:jar:1.5:compile
[INFO]    dom4j:dom4j:jar:1.6.1:compile
[INFO]    commons-lang:commons-lang:jar:2.1:compile
[INFO]    xerces:xercesImpl:jar:2.6.2:compile
[INFO]    commons-collections:commons-collections:jar:3.1:compile
[INFO]    junit:junit:jar:3.8.1:test
[INFO]    jdom:jdom:jar:1.0:compile
[INFO]    xalan:xalan:jar:2.6.0:compile
[INFO]    jaxen:jaxen:jar:1.1.1:compile
[INFO]    commons-io:commons-io:jar:1.3.2:test
[INFO]    xom:xom:jar:1.0:compile

Show dependencies in tree style

Command

mvn dependency:tree

What will we got

[INFO] org.sonatype.mavenbook.custom:simple-weather:jar:0.8-SNAPSHOT
[INFO] +- log4j:log4j:jar:1.2.14:compile
[INFO] +- dom4j:dom4j:jar:1.6.1:compile
[INFO] |  \- xml-apis:xml-apis:jar:1.0.b2:compile
[INFO] +- jaxen:jaxen:jar:1.1.1:compile
[INFO] |  +- jdom:jdom:jar:1.0:compile
[INFO] |  +- xerces:xercesImpl:jar:2.6.2:compile
[INFO] |  \- xom:xom:jar:1.0:compile
[INFO] |     +- xerces:xmlParserAPIs:jar:2.6.2:compile
[INFO] |     +- xalan:xalan:jar:2.6.0:compile
[INFO] |     \- com.ibm.icu:icu4j:jar:2.6.1:compile
[INFO] +- velocity:velocity:jar:1.5:compile
[INFO] |  +- commons-collections:commons-collections:jar:3.1:compile
[INFO] |  +- commons-lang:commons-lang:jar:2.1:compile
[INFO] |  \- oro:oro:jar:2.0.8:compile
[INFO] +- commons-io:commons-io:jar:1.3.2:test
[INFO] \- junit:junit:jar:3.8.1:test

Verbose Output

Command

mvn install -X

What will we got

• It outputs tons of verbose information, such as why each jars are included or excluded.

How to skipping unit tests

mvn install -Dmaven.test.skip=true

Show description of a plugin

mvn help:describe -Dplugin=exec -Dfull

Create a jar with dependencies

mvn assembly:attached

• This might need additional configuration of the plugin in the pom.xml

Run Jetty and deploy the WAR

mvn jetty:run

• This might be useful for some proto-typing of servlet or jsp.
• This might need additional configuration of the plugin in the pom.xml

Project Hierarchy

• Every Maven projects can have children or its parent.
• It's useful for declare common dependencies (using dependencyManagement) or plugins (using pluginManagement).
  • Child pom.xml can omit “version” element in dependencies that are declared in dependencyManagement of the parent pom.xml

Analyze “used undeclared” or “unused declared” dependencies

mvn dependency:analyze

Environment

• Apache Maven 3.1.1
• Eclipse Kepler SR1
• Oracle JDK7u51
• OS X 10.9.1

Why need to do it?

• Many kind of dependency resolving work can take on Maven.
• It is a better way than that take it on Eclipse or IDEs.
  • It is stable and it has some efficient mechanism like local repository.
  • We can just put in Jenkins job or shell scripts.
  • It makes automation of some annoying works (e.g. build, deploy, etc) much easier.
• Thus, in this post, I'm going to try to resolve a dependency through local repository of Maven.

Create a project

• I'm going to install this project to local repository.
• After install, I will try to resolve a dependency to it from another project.

Create a project

• Create a maven project named “hogeproject” in Eclipse.
  • Check “Create a simple project (skip archetype selection)”

Edit pom.xml

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>org.nailedtothex</groupId>
    <artifactId>hogeproject</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <properties>
        <maven.compiler.source>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
</project>

Make a class

package hogeproject;

public class Hello {

    public String hello() {
        return "hello from hogeproject";
    }
}

Install the project to Maven repository

kyle-no-MacBook:hogeproject kyle$ pwd
/Users/kyle/Documents/workspace/hogeproject
kyle-no-MacBook:hogeproject kyle$ ls -l
total 8
-rw-r--r--+ 1 kyle  staff  566  2 23 17:07 pom.xml
drwxr-xr-x+ 4 kyle  staff  136  2 23 17:01 src
drwxr-xr-x+ 7 kyle  staff  238  2 23 17:12 target
kyle-no-MacBook:hogeproject kyle$ mvn install
Picked up _JAVA_OPTIONS: -Dfile.encoding=UTF-8
[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building hogeproject 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ hogeproject ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 0 resource
[INFO] 
[INFO] --- maven-compiler-plugin:2.5.1:compile (default-compile) @ hogeproject ---
[INFO] Nothing to compile - all classes are up to date
[INFO] 
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ hogeproject ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 0 resource
[INFO] 
[INFO] --- maven-compiler-plugin:2.5.1:testCompile (default-testCompile) @ hogeproject ---
[INFO] Nothing to compile - all classes are up to date
[INFO] 
[INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ hogeproject ---
[INFO] 
[INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ hogeproject ---
[INFO] 
[INFO] --- maven-install-plugin:2.4:install (default-install) @ hogeproject ---
Downloading: http://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-utils/3.0.5/plexus-utils-3.0.5.pom
Downloaded: http://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-utils/3.0.5/plexus-utils-3.0.5.pom (3 KB at 2.3 KB/sec)
Downloading: http://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-utils/3.0.5/plexus-utils-3.0.5.jar
Downloaded: http://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-utils/3.0.5/plexus-utils-3.0.5.jar (226 KB at 193.3 KB/sec)
[INFO] Installing /Users/kyle/Documents/workspace/hogeproject/target/hogeproject-0.0.1-SNAPSHOT.jar to /Users/kyle/.m2/repository/org/nailedtothex/hogeproject/0.0.1-SNAPSHOT/hogeproject-0.0.1-SNAPSHOT.jar
[INFO] Installing /Users/kyle/Documents/workspace/hogeproject/pom.xml to /Users/kyle/.m2/repository/org/nailedtothex/hogeproject/0.0.1-SNAPSHOT/hogeproject-0.0.1-SNAPSHOT.pom
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.438s
[INFO] Finished at: Sun Feb 23 17:19:25 JST 2014
[INFO] Final Memory: 11M/245M
[INFO] ------------------------------------------------------------------------
kyle-no-MacBook:hogeproject kyle$ 

• It showed that the jar file and pom.xml were placed somewhere under $HOME/.m2/repository.

Create an another project

• Create in Eclipse same way as above. Name is “higeproject”

pom.xml

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>org.nailedtothex</groupId>
    <artifactId>higeproject</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>
    <properties>
        <maven.compiler.source>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <failOnMissingWebXml>false</failOnMissingWebXml>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.nailedtothex</groupId>
            <artifactId>hogeproject</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
    </dependencies>
</project>

• A dependency to hogeproject is specified.

Build the package by Maven

kyle-no-MacBook:higeproject kyle$ ls -l
total 8
-rw-r--r--+ 1 kyle  staff  825  2 23 17:27 pom.xml
drwxr-xr-x+ 4 kyle  staff  136  2 23 17:23 src
drwxr-xr-x+ 9 kyle  staff  306  2 23 17:27 target
kyle-no-MacBook:higeproject kyle$ pwd
/Users/kyle/Documents/workspace/higeproject
kyle-no-MacBook:higeproject kyle$ mvn clean package
Picked up _JAVA_OPTIONS: -Dfile.encoding=UTF-8
[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building higeproject 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ higeproject ---
[INFO] Deleting /Users/kyle/Documents/workspace/higeproject/target
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ higeproject ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 0 resource
[INFO] 
[INFO] --- maven-compiler-plugin:2.5.1:compile (default-compile) @ higeproject ---
[INFO] Nothing to compile - all classes are up to date
[INFO] 
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ higeproject ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 0 resource
[INFO] 
[INFO] --- maven-compiler-plugin:2.5.1:testCompile (default-testCompile) @ higeproject ---
[INFO] Nothing to compile - all classes are up to date
[INFO] 
[INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ higeproject ---
[INFO] 
[INFO] --- maven-war-plugin:2.2:war (default-war) @ higeproject ---
[INFO] Packaging webapp
[INFO] Assembling webapp [higeproject] in [/Users/kyle/Documents/workspace/higeproject/target/higeproject-0.0.1-SNAPSHOT]
[INFO] Processing war project
[INFO] Copying webapp resources [/Users/kyle/Documents/workspace/higeproject/src/main/webapp]
[INFO] Webapp assembled in [23 msecs]
[INFO] Building war: /Users/kyle/Documents/workspace/higeproject/target/higeproject-0.0.1-SNAPSHOT.war
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.106s
[INFO] Finished at: Sun Feb 23 17:31:39 JST 2014
[INFO] Final Memory: 9M/245M
[INFO] ------------------------------------------------------------------------
kyle-no-MacBook:higeproject kyle$ unzip -l target/
classes/                        higeproject-0.0.1-SNAPSHOT/     higeproject-0.0.1-SNAPSHOT.war  maven-archiver/                 test-classes/
kyle-no-MacBook:higeproject kyle$ unzip -l target/higeproject-0.0.1-SNAPSHOT.war 
Archive:  target/higeproject-0.0.1-SNAPSHOT.war
  Length     Date   Time    Name
 --------    ----   ----    ----
        0  02-23-14 17:31   META-INF/
      129  02-23-14 17:31   META-INF/MANIFEST.MF
        0  02-23-14 17:31   WEB-INF/
        0  02-23-14 17:31   WEB-INF/classes/
        0  02-23-14 17:31   WEB-INF/lib/
     1986  02-23-14 17:12   WEB-INF/lib/hogeproject-0.0.1-SNAPSHOT.jar
        0  02-23-14 17:31   META-INF/maven/
        0  02-23-14 17:31   META-INF/maven/org.nailedtothex/
        0  02-23-14 17:31   META-INF/maven/org.nailedtothex/higeproject/
      825  02-23-14 17:27   META-INF/maven/org.nailedtothex/higeproject/pom.xml
      121  02-23-14 17:31   META-INF/maven/org.nailedtothex/higeproject/pom.properties
 --------                   -------
     3061                   11 files
kyle-no-MacBook:higeproject kyle$ 

• We can see that the WAR contains “hogeproject-0.0.1-SNAPSHOT.jar”.

References

1. Maven - Running Maven

Environment

• Jenkins 1.551
• git version 1.8.3.4 (Apple Git-47)
• OS X 10.9.1

Why need it?

• As I wrote in How to make git commit to trigger run a Jenkins job, Git plugin of Eclipse doesn't fire hooks.
  • Unfortunately, currently EGit not supported it, and maybe will not[1].
• So we need an alternative way, such as make Jenkins to poll SCM periodically.
  • It seems to I can configure it easily so I just try it here.

How to configure

1. Go to configure page of a project.
2. Go to “Build Triggers” section.
3. Check “Poll SCM”
4. Enter the schedule that you want in cron-style.
   • The help that placed side of input area might be useful
   • Example for poll at every 15minutes is here:
5. Save

See the log

• When any change is detected at polling, we can see that message in log of Jenkins.
  • In this setup, the log file is located at /var/log/jenkins/jenkins.log

Feb 23, 2014 11:24:45 AM hudson.triggers.SCMTrigger$Runner run
情報: SCM changes detected in BuildAndTestHead. Triggering  #22
Feb 23, 2014 11:24:57 AM hudson.model.Run execute
情報: BuildAndTestHead #22 main build action completed: SUCCESS

Remarks

• I'm not sure that CPU usage or any other resource consumption of git polling.

References

1. Eclipse Community Forums: EGit » Enabling hooks in EGit