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The IntelliJ cannot find the mysql-connector-java dependency and hits error "unknown was not found"? pom.xml <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> Terminal mysql:mysql-connector-java:jar:unknown was not found in https://repo.maven.apache.org/maven2 during a previous attempt. This failure was cached in the local repository and resolution is not reattempted until the update interval of central has elapsed or updates are […]

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maven 2 comments

This article shows how to generate the Maven Wrapper files in a Maven project: mvnw (For Linux or macOS) mvnw.cmd (For Windows) .mvn/wrapper/maven-wrapper.jar .mvn/wrapper/maven-wrapper.properties Table of contents 1. What is Maven Wrapper 2. Generate the mvnw and mvnw.cmd 2.1 Ensure Maven installed 2.2 Navigate to the Maven project 2.3 Generate Maven Wrapper files 2.4 Build […]

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maven 12 comments

We upgraded the project from Java 11 to Java 17, and mvn test hits the Fatal error compiling: error: invalid target release: 17 pom.xml <properties> <java.version>17</java.version> </properties> Terminal mvn test [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project spring-boot-hello: Fatal error compiling: error: invalid target release: 17 -> [Help 1] The Java version is […]

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maven 20 comments

Maven compiles and hits the following fatal error messages: Terminal mvn compile Fatal error compiling: error: invalid target release: 1.11 pom.xml <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.8.1</version> <configuration> <source>1.11</source> <target>1.11</target> </configuration> </plugin> Solution For maven-compiler-plugin, the correct JDK version is 1.8, 1.9, 1.10, 10, 11, 12 … 17 … pom.xml <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.8.0</version> <configuration> <source>11</source> <target>11</target> […]

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maven 1 comment

Maven compiles and hits the following maven-compiler-plugin error? The POM for org.apache.maven.plugins:maven-compiler-plugin:jar:3.8.1 is missing, no dependency information available pom.xml <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.8.1</version> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> Terminal > mvn compile [INFO] Scanning for projects… [INFO] [INFO] ——————–< com.mkyong.core:junit5-maven >——————– [INFO] Building junit5-maven 1.0 [INFO] ——————————–[ jar ]——————————— [WARNING] The POM for org.apache.maven.plugins:maven-compiler-plugin:jar:3.8.1 is […]

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maven 6 comments

In IntelliJ IDEA, Maven builds a project, and hits the following warning message? Warning:java: source value 1.5 is obsolete and will be removed in a future release Warning:java: target value 1.5 is obsolete and will be removed in a future release To fix it, add maven-compiler-plugin plugin. pom.xml <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.8.0</version> <configuration> […]

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maven 4 comments

In Maven, you can use Apache Maven Dependency Plugin, goal dependency:purge-local-repository to remove the project dependencies from the local repository, and re-download it again. Terminal $ mvn dependency:purge-local-repository [INFO] Scanning for projects… [INFO] [INFO] ————–< com.mkyong.examples:maven-code-coverage >————— [INFO] Building maven-code-coverage 1.0-SNAPSHOT [INFO] ——————————–[ jar ]——————————— [INFO] [INFO] — maven-dependency-plugin:2.8:purge-local-repository (default-cli) @ maven-code-coverage — Downloading from […]

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maven 2 comments

In this article, we will show you how to use Maven PMD Plugin to analyze the Java code. P.S PMD requires Java 1.7 1. Maven PMD Plugin Define the maven-pmd-plugin in the reporting tag, so that mvn site will generate the PMD report. pom.xml <reporting> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-pmd-plugin</artifactId> <version>3.11.0</version> </plugin> </plugins> </reporting> 2. Java […]

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maven 11 comments

Generating a Maven report with mvn site, but hits the following errors java.lang.NoClassDefFoundError: org/apache/maven/doxia/siterenderer/DocumentContent Caused by: java.lang.ClassNotFoundException: org.apache.maven.doxia.siterenderer.DocumentContent [INFO] ———————————————————————— [INFO] BUILD FAILURE [INFO] ———————————————————————— [INFO] Total time: 28.280 s [INFO] Finished at: 2018-11-19T13:20:14+08:00 [INFO] ———————————————————————— [ERROR] Failed to execute goal org.apache.maven.plugins:maven-site-plugin:3.3:site (default-site) on project maven-static-code-analysis: Execution default-site of goal org.apache.maven.plugins:maven-site-plugin:3.3:site failed: A required class […]

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maven 11 comments

In this article, we will show you few Maven profile examples to pass different parameters (server or database parameters) for different environments (dev, test or prod). P.S Tested with Maven 3.5.3 1. Basic Maven Profiles 1.1 A simple profile to skip the unit test. pom.xml <!– skip unit test –> <profile> <id>xtest</id> <properties> <maven.test.skip>true</maven.test.skip> </properties> […]

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In this tutorial, we will show you how to use Maven to manage a Multi-module project containing four modules : Password module – Interface only. Password md5 module – Password module implementation, MD5 password hashing. Password sha module – Password module implementation, SHA password hashing. Web module – A simple MVC web app to hash […]

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maven 4 comments

Review the following jUnit 5 examples to test a Spring 5 MVC web application. TestWelcome.java package com.mkyong.web; import com.mkyong.web.config.SpringConfig; import org.junit.jupiter.api.BeforeEach; import org.junit.jupiter.api.Test; import org.junit.jupiter.api.extension.ExtendWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.junit.jupiter.SpringExtension; import org.springframework.test.context.web.WebAppConfiguration; import org.springframework.test.web.servlet.MockMvc; import org.springframework.test.web.servlet.setup.MockMvcBuilders; import org.springframework.web.context.WebApplicationContext; import static org.junit.jupiter.api.Assertions.assertEquals; import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get; import static org.springframework.test.web.servlet.result.MockMvcResultHandlers.print; import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*; @ExtendWith(SpringExtension.class) @WebAppConfiguration @ContextConfiguration(classes = […]

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In Maven, you can use mvn help:effective-pom to list all the current project’s plugins and its version. D:\maven-examples\java-web-project> mvn help:effective-pom [INFO] Scanning for projects… [INFO] [INFO] ——————< com.mkyong.web:java-web-project >——————- [INFO] Building java-web-project Maven Webapp 1.0-SNAPSHOT [INFO] ——————————–[ war ]——————————— [INFO] [INFO] — maven-help-plugin:3.1.0:effective-pom (default-cli) @ java-web-project — [INFO] Effective POMs, after inheritance, interpolation, and profiles […]

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maven 7 comments

In pom.xml, defined this maven.compiler.source properties to tell Maven to use Java 8 to compile the project. 1. Maven Properties Java 8 pom.xml <properties> <maven.compiler.target>1.8</maven.compiler.target> <maven.compiler.source>1.8</maven.compiler.source> </properties> Java 7 pom.xml <properties> <maven.compiler.target>1.7</maven.compiler.target> <maven.compiler.source>1.7</maven.compiler.source> </properties> 2. Compiler Plugin Alternative, configure the plugin directly. pom.xml <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.6.1</version> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> </plugins> […]

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maven 7 comments

Maven package a web application and hits the following error message : $ mvn package //… [ERROR] Failed to execute goal org.apache.maven.plugins:maven-war-plugin:2.2:war (default-war) on project spring4-mvc-maven-ajax-example: Error assembling WAR: webxml attribute is required (or pre-existing WEB-INF/web.xml if executing in update mode) -> [Help 1] Solution 1. For servlet container < 3, make sure WEB-INF/web.xml file […]

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maven 2 comments

Start a Java webapp with Maven Jetty plugin. $ mvn jetty:run 1. Problem But it hits the following error messages : [WARNING] FAILED org.eclipse.jetty.maven.plugin.JettyServer@1f53481b: java.net.BindException: Address already in use at sun.nio.ch.Net.bind0(Native Method) at sun.nio.ch.Net.bind(Net.java:433) at sun.nio.ch.Net.bind(Net.java:425) at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223) at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74) at org.eclipse.jetty.server.ServerConnector.open(ServerConnector.java:321) at org.eclipse.jetty.server.AbstractNetworkConnector.doStart(AbstractNetworkConnector.java:80) //… 2. Solution By default, the maven-jetty-plugin start Jetty on port […]

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maven 6 comments

Few Maven Jetty 8.x and 9.x plugin examples, just for quick reference. 1. Maven Jetty Plugin 9.x Note You need to use Maven 3 and Java 1.7 for Maven Jetty 9.x plugin. 1.1 The ‘groupId’ is org.eclipse.jetty, by default, it runs on port 8080, in root context ‘/’. pom.xml <plugin> <groupId>org.eclipse.jetty</groupId> <artifactId>jetty-maven-plugin</artifactId> <version>9.2.11.v20150529</version> </plugin> To […]

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In Maven, you can use mvn dependency:tree to display the project dependencies in tree format. 1. Maven Project Review a simple Maven project, declared Spring and logback dependencies. pom.xml <properties> <spring.version>4.1.6.RELEASE</spring.version> <logback.version>1.1.3</logback.version> <jcl.slf4j.version>1.7.12</jcl.slf4j.version> </properties> <dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${spring.version}</version> <exclusions> <exclusion> <groupId>commons-logging</groupId> <artifactId>commons-logging</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>jcl-over-slf4j</artifactId> <version>${jcl.slf4j.version}</version> […]

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maven 3 comments

This example shows you how to use Maven to exclude the log4j.properties file from your Jar file. Note Please, DO NOT include the log4j.properties into the final Jar file, it will cause multiple log4j.properties files in the classpath, if someone is depending on your Jar, you may accidentally override their logging configurations, depends which Jar […]

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maven 2 comments

Creating a Maven site, but the build is very slow to generate the dependency report. C:\mkyong_projects\>mvn site [INFO] Scanning for projects… [INFO] [INFO] ————————————– [INFO] Building Maven Webapp 1.0-SNAPSHOT [INFO] ————————————– [INFO] //… [INFO] Generating "Project License" report [INFO] Generating "Project Team" report [INFO] Generating "Project Summary" report [INFO] Generating "Dependencies" report //…… Hanging here… […]

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maven 4 comments

Custom properties or variables are useful to keep your Maven pom.xml file more easy to read and maintain. File : pom.xml <project> … <properties> <my.plugin.version>1.5</my.plugin.version> </properties> … </project> In above pom.xml, you can refer “my.plugin.version” via code ${my.plugin.version}. Example 1 A classic use case is used to define a jar or plugin version. <properties> <spring.version>3.1.2.RELEASE</spring.version> […]

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