The Apache camel tutorial below creates a route to poll the c:/temp/simple folder every minute (i.e. 60000 milliseconds) for files with patterns like test1.csv, test2.csv, etc. These files are then zipped and copied to the archive folder under c:/temp/simple.
Step 1: Define the Apache camel and spring libraries required.
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Batch jobs with Spring batch framework is very common and popular. This tutorial assumes that
1) You have set up you Java, Maven, and Eclipse
Once you have followed the following steps, you should have a project structure as shown below.
Step 1: Create a new Maven project with the command shown below.
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BeanIO is an open source Java framework for marshaling and marshaling Java beans from a flat file, stream, or simple String object. It is very powerful with support for XML, CSV, delimited and fixed length stream formats, Object binding, filed validation, integration with spring-batch, etc. Here is a basic tutorial to get started.
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In Spring 3.0 the support for the CDI annotations @Named and @Inject are provided.
1) @Inject instead of Spring’s @Autowired to inject a bean.
2) @Named instead of Spring’s @Component to declare a bean.
Step 1: Create a simple Maven project.
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Step 1: The pom.xml with the checkstyle plugin 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> //... <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>false</cobertura.skip> <checkstyle.failOnError>true</checkstyle.failOnError> <checkstyle.consoleOutput>true</checkstyle.consoleOutput> </properties> //... <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-checkstyle-plugin</artifactId> <executions> <execution> <goals> <goal>check</goal> </goals> </execution> </executions> <configuration> <failsOnError>${checkstyle.failOnError}</failsOnError> <consoleOutput>${checkstyle.consoleOutput}</consoleOutput> <configLocation>src/main/resources/checkstyle/myapp-checks.xml</configLocation> <suppressionsLocation>src/main/resources/checkstyle/myapp-suppressions.xml</suppressionsLocation> <suppressionsFileExpression>checkstyle.suppressions.file.tag</suppressionsFileExpression> <propertyExpansion>checkstyle_config_dir=checkstyle</propertyExpansion> <propertyExpansion>checkstyle.suppressions.file=${project.build.directory}/checkstyle-suppressions.xml</propertyExpansion> </configuration> </plugin> </plugins> </build> </project> |
Step 2: The checkstyle files that define the rules.
src/main/resources/checkstyle/myapp-checks.xml
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<?xml version="1.0"?> <!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.1//EN" "http://www.puppycrawl.com/dtds/configuration_1_1.dtd"> <module name="Checker"> <module name="Translation"/> <module name="SuppressionCommentFilter"/> <module name="TreeWalker"> <!-- Check use of Spaces and not TABs (4 spaces) --> <property name="tabWidth" value="4" /> <module name="GenericWhitespace" /> <module name="CyclomaticComplexity"> <property name="max" value="15"/> </module> <module name="ConstantName"/> <module name="LocalFinalVariableName"/> <module name="LocalVariableName"/> <module name="MemberName"> <property name="format" value="(^serial|^[a-z][a-zA-Z0-9]*$)"/> </module> <module name="MethodName"/> <module name="PackageName"/> <module name="ParameterName"/> <module name="StaticVariableName"> <property name="format" value="(^serial|^[a-z][a-zA-Z0-9]*$)"/> </module> <module name="TypeName"/> <module name="MutableException"/> <module name="AvoidStarImport"/> <module name="IllegalImport"/> <module name="RedundantImport"/> <module name="UnusedImports"/> <module name="LineLength"> <property name="max" value="130"/> </module> <module name="ParameterNumber"> <property name="max" value="8"/> </module> <module name="EmptyForIteratorPad"/> <module name="NoWhitespaceAfter"/> <module name="NoWhitespaceBefore"/> <module name="OperatorWrap"/> <module name="ParenPad"/> <module name="TypecastParenPad"/> <module name="WhitespaceAfter"> <property name="tokens" value="COMMA, SEMI"/> </module> <module name="WhitespaceAround"> <property name="tokens" value="ASSIGN, BAND, BAND_ASSIGN, BOR, BOR_ASSIGN, BSR, BSR_ASSIGN, BXOR, BXOR_ASSIGN, COLON, DIV, DIV_ASSIGN, EQUAL, GE, GT, LAND, LE, LITERAL_ASSERT, LITERAL_CATCH, LITERAL_DO, LITERAL_ELSE, LITERAL_FINALLY, LITERAL_FOR, LITERAL_IF, LITERAL_RETURN, LITERAL_SYNCHRONIZED, LITERAL_TRY, LITERAL_WHILE, LOR, LT, MINUS, MINUS_ASSIGN, MOD, MOD_ASSIGN, NOT_EQUAL, PLUS, PLUS_ASSIGN, QUESTION, SL, SLIST, SL_ASSIGN, SR, SR_ASSIGN, STAR, STAR_ASSIGN, TYPE_EXTENSION_AND"/> </module> <module name="ModifierOrder"/> <module name="RedundantModifier"/> <module name="AvoidNestedBlocks"/> <module name="EmptyBlock"/> <module name="LeftCurly"/> <module name="NeedBraces"> <property name="tokens" value="LITERAL_DO, LITERAL_FOR, LITERAL_WHILE"/> </module> <module name="RightCurly"/> <!-- This check has been removed from Checkstyle 5.6 --> <!--<module name="DoubleCheckedLocking"/>--> <module name="EmptyStatement"/> <module name="IllegalInstantiation"/> <module name="InnerAssignment"/> <module name="MissingSwitchDefault"/> <!-- RedundantThrows was removed with version 6.2 --> <!--<module name="RedundantThrows"/>--> <module name="SimplifyBooleanExpression"/> <module name="SimplifyBooleanReturn"/> <module name="SuperClone"/> <module name="FinalClass"/> <module name="HideUtilityClassConstructor"/> <module name="InterfaceIsType"/> <module name="VisibilityModifier"> <property name="protectedAllowed" value="true"/> </module> <module name="ArrayTypeStyle"/> <module name="TodoComment"/> <module name="UpperEll"/> <module name="FileContentsHolder"/> <!-- Checks correct indentation of Java Code. --> <module name="Indentation"> <!-- how many spaces to use for new indentation level --> <property name="basicOffset" value="4" /> <!-- how far brace should be indented when on next line --> <property name="braceAdjustment" value="0" /> <!-- how much to indent a case label --> <property name="caseIndent" value="4" /> </module> <!-- Checks for Javadoc comments in public methods/variables only --> <module name="JavadocMethod"> <property name="scope" value="public" /> <property name="allowMissingPropertyJavadoc" value="true" /> </module> <module name="JavadocType"> <property name="scope" value="public" /> <property name="allowUnknownTags" value="true" /> </module> <module name="JavadocVariable"> <property name="scope" value="public" /> </module> <!-- all JavaDoc must have the right style, regardless of the scope --> <module name="JavadocStyle"> <property name="scope" value="public" /> </module> </module> <!-- No TAB characters in the source code --> <module name="FileTabCharacter"> <property name="eachLine" value="true" /> <property name="fileExtensions" value="java,properties,xml,wsdl" /> </module> <module name="RegexpMultiline"> <property name="id" value="consoleOutput" /> <property name="format" value="System\.(out)|(err)\.print(ln)?\(" /> <property name="message" value="Writing to System.out and System.err not allowed - use logger instead" /> </module> <module name="RegexpMultiline"> <property name="format" value="\.printStackTrace\(\s*\)" /> <property name="message" value="Calling printStackTrace on an exception is not allowed - use logger instead" /> </module> <module name="RegexpMultiline"> <property name="format" value="java\.util\.(Date|Calendar)"/> <property name="message" value="DO NOT USE java.util.Date or java.util.Calendar! Use Joda time instead!"/> </module> <module name="RegexpMultiline"> <property name="format" value="(System|Runtime\.getRuntime\(\))\.exit"/> <property name="message" value="Should not exit the JVM."/> </module> </module> |
src/main/resources/checkstyle/myapp-suppressions.xml
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<?xml version="1.0"?> <!DOCTYPE suppressions PUBLIC "-//Puppy Crawl//DTD Suppressions 1.1//EN" "http://www.puppycrawl.com/dtds/suppressions_1_1.dtd"> <suppressions> <!-- Turn off all checks for Generated and Test code. --> <!-- Suppressions for test code --> <suppress checks="IllegalCatch" files="[/\\]test[/\\]"/> <suppress checks="ImportControl" files="[/\\]test[/\\]"/> <suppress checks="MethodLength" files="[/\\]test[/\\]"/> <suppress checks="MethodName" files="[/\\]test[/\\]"/> <suppress checks="TypeName" files="[/\\]test[/\\]"/> <suppress checks="MagicNumber" files="[/\\]test[/\\]"/> <suppress checks="JavadocMethod" files="[/\\]test[/\\]"/> <suppress checks="JavadocStyle" files="[/\\]test[/\\]"/> <suppress checks="JavadocType" files="[/\\]test[/\\]"/> <suppress checks="JavadocVariable" files="[/\\]test[/\\]"/> <suppress checks="IllegalThrows" files="[/\\]test[/\\]"/> <suppress checks="IllegalInstantiation" files="[/\\]test[/\\]"/> <suppress checks="ParameterNumberCheck" files="[/\\]test[/\\]"/> <suppress id="warningCyclomaticComplexity" files="[/\\]test[/\\]"/> <suppress id="warningFileLength" files="[/\\]test[/\\]"/> <!-- don't check generated code, this to work on Unix (/) and Windows (\) --> <suppress checks="." files="[/\\]generated-sources[/\\]"/> <!-- End of test code suppressions --> </suppressions> |
Step 3: Running via mvn command.
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This extends the tutorials on Pentaho DI 1) Part 1: Pentaho with user defined Java transformer tutorial. 2) Part 2: Invoking a Pentaho DI (i.e. Kettle) transformation from Java. 2) Part 3: Passing Pentaho DI (i.e. … Read more ›...
Profiles are very handy in maven to use different JDK versions, include different files for different environments, etc.
Step 1: Say you have a pom.xml file using Java 7 to compile.
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<properties> <javac.src.version>1.7</javac.src.version> <javac.target.version>1.7</javac.target.version> </properties> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.2</version> <configuration> <source>${javac.src.version}</source> <target>${javac.target.version}</target> </configuration> </plugin> |
Step 2: Say now you want to compile using Java 1.5.
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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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