Java beginners to create a simple web application (i.e. a Web ARchive file — i.e. a war file). Prerequisite is that you have set up Java, Maven, and Eclipse.
Step 1: Execute the Maven maven-archetype-webapp command to create the Maven web structure with the following command on a DOS command prompt.
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“Creating a simple Java Web project with Maven – part 1” covered developing a simple Java web application using Maven. This part is all about understanding the war and pom files. 1. The lib directory Q. … Read more ›...
“Creating a simple Java Web project with Maven – part 1” covered developing a simple Java web application using Maven. “Creating a simple Java Web project with Maven – part 2 (Understanding war and pom.xml)” elaborated on war and pom.xml. … Read more ›...
Often you get to work on a fully functional Java application that is already in production to fix production issues or to enhance its existing functionality. As a new Java developer in the team, it is not easy to get started and contributing. The approach would be slightly different from working on a brand new project.
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Debugging Maven issues and tips. At times maven can cause issues relating to jar conflicts or not having the required jar file in the repository.
Q. In your experience, what are some of the challenges you faced with maven, and how do you over come them?
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DOS scripts are very handy to automate tasks. This example illustrates a DOS script used to bootstrap a Spring batch job.
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set BASE_DIR=c:/users/sam/batch dir %BASE_DIR%/my-app-batch/lib/* set LOGFILE=%BASE_DIR%/logs/pr-batch-run.log set G_cDateToRunFor="2015/04/29" set ENV=dev set JAVA_PROP=%BASE_DIR%/prop/java/prop set G_cPasswordFile=%BASE_DIR%/prop/password.prop set G_cJavaClasspath="%BASE_DIR%/my-app-batch/conf;%BASE_DIR%/my-app-batch;%JAVA_PROP%;%BASE_DIR%/prop;%BASE_DIR%/my-app-batch/lib/*" echo 'BASE_DIR='%BASE_DIR% echo 'LOGFILE='%LOGFILE% echo 'G_cDateToRunFor='%G_cDateToRunFor% echo 'ENV='%ENV% echo 'JAVA_PROP='%JAVA_PROP% echo 'G_cPasswordFile='%G_cPasswordFile% echo "" echo "G_cJavaClasspath="%G_cJavaClasspath% echo "" REM an example of bootsrapping a spring batch job echo "%JAVA_HOME%/bin/java -DENV=%ENV% -cp %G_cJavaClasspath% -Dds.password.file=%G_cPasswordFile% -Dorg.apache.cxf.Logger=org.apache.cxf.common.logging.Slf4jLogger org.springframework.batch.core.launch.support.CommandLineJobRunner com/mayapp/myapp-batch.xml processThisJob" echo "%JAVA_HOME%" REM Xrunjdwp is for debugging & setting suspend to y to wait till the debugger is connected say from eclipse %JAVA_HOME%/bin/java -Xdebug -Xrunjdwp:transport=dt_socket,address=9000,server=y,suspend=n \ -cp %G_cJavaClasspath% -DENV=%ENV% -Dds.password.file=%G_cPasswordFile% \ -Dorg.apache.cxf.Logger=org.apache.cxf.common.logging.Slf4jLogger org.springframework.batch.core.launch.support.CommandLineJobRunner com/mayapp/myapp-batch.xml processThisJob \ "RUN_DATE(date)=%G_cDateToRunFor%" >> %LOGFILE% 2>&1 |
1) DOS variables are marked as %VARIABLE_NAME%
2) Remarks or comments are prefixed with REM
3) variables are assigned with “
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Dozer is a framework that maps fields from source bean to target bean.
Practical scenarios to map source bean to target bean?
1) Applications A and B might be having different contracts and objects need to be converted from A to B. For example, Mapping JAXB Objects to Business/Domain Objects.
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This tutorial compliments Basic Dozer Tutorial by adding Spring.
Step 1: Create a simple Maven project from a command-line. Just press enter for all the prompts.
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mvn archetype:generate -DgroupId=com.mytutorial -DartifactId=simple-dozer |
Step 2: Import the above “simple-dozer” folder in the file system into eclipse.
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This assumes that you have gone through “Setting up Java, Maven, and Eclipse”
#1. Creating the source folder like src/main/java, src/main/resource, etc via eclipse IDE
To create a new source folder under src/main/, right mouse click on project say “simple”.
click on finish.
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You can take a Java POJO (i.e. Plain Old Java Object) and expose it as an MBean, and view or modify values via JMX. In this tutorial, we will use jconsole, which is a JMX client. Step 1: Create a new Maven based Java project.
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mvn archetype:generate -DgroupId=com.mytutorial -DartifactId=simpleMbean -DinteractiveMode=false |
Step 2: Import it...
Findbugs is an open source project for a static analysis of the Java bytecode to identify potential software bugs.
Step 1: The pom.xml with the findbug & site reporting plugins and properties.
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<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>com.mytutorial</groupId> <artifactId>simpleSpringRestWeb</artifactId> <version>1.0-SNAPSHOT</version> <packaging>war</packaging> <name>simpleSpringRestWeb</name> <url>http://maven.apache.org</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <slf4j.version>1.7.10</slf4j.version> <commons-logging.version>1.1.1</commons-logging.version> <spring.version>4.0.9.RELEASE</spring.version> <javac.src.version>1.7</javac.src.version> <javac.target.version>1.7</javac.target.version> <test.coverage.rate>100</test.coverage.rate> <cobertura.skip>true</cobertura.skip> <findbugs.skip>false</findbugs.skip> <findbugs.failOnError>false</findbugs.failOnError> </properties> <dependencies> //..... <dependency> <groupId>net.sourceforge.findbugs</groupId> <artifactId>jsr305</artifactId> <version>1.3.7</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>findbugs-maven-plugin</artifactId> <executions> <execution> <goals> <goal>check</goal> </goals> </execution> </executions> <configuration> <effort>Max</effort> <threshold>Low</threshold> <skip>${findbugs.skip}</skip> <failOnError>${findbugs.failOnError}</failOnError> <xmlOutput>true</xmlOutput> <excludeFilterFile>src/main/resources/findbugs/excludeFilter.xml</excludeFilterFile> <outputDirectory>target/site</outputDirectory> <xmlOutput>true</xmlOutput> </configuration> </plugin> </plugins> </build> <reporting> <plugins> <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>findbugs-maven-plugin</artifactId> <version>2.5.5</version> </plugin> <!-- Normally, we take off the dependency report, saves time. --> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-project-info-reports-plugin</artifactId> <version>2.7</version> <configuration> <dependencyLocationsEnabled>false</dependencyLocationsEnabled> </configuration> </plugin> </plugins> </reporting> </project> |
Step 2: Exclude certain classes with an exclude filter
src/main/resources/findbugs/excludeFilter.xml
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<FindBugsFilter> <Match> <Package name="~.*\.dto.*" /> </Match> </FindBugsFilter> |
Step 3: Running mvn command to spot bugs
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mvn clean package |
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[INFO] Error size is 0 [INFO] Total bugs: 1 [INFO] com.mytutorial.Hello doesn't override org.springframework.hateoas.ResourceSupport.equals(Object) [com.mytutorial.Hello] At Hello.java:[line 1] [INFO] |
Step 4: Running mvn command to report bugs
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mvn site |
this creates the file “findbugs.html”
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Firstly, decide on the specification version. If you are using FIX spec 4.4 then go to https://fixspec.com/FIX44. The tutorials with QuickFIX/J used NewSingleOrder as the request. The message has the fields like Tag number. … Read more ›...
QuickFixJ is a FIX (Financial Information eXchange) engine for Java. Handy to have knowledge on FIX protocol if you aspire to work for investment banks and other financial services companies. FIX router and FIX engines are depicted below. Step 1: Create a new Maven based Java project. … Read more...