Red Hat SummitChapter 2. Getting Started
2.1. Prerequisites
Before using the Maven plugin, verify that you meet the following prerequisites.
- Java Platform, JRE version 8+
- A minimum of 4 GB RAM; 8 GB recommended
- Maven version 3.2.5 or later
If you are running macOS, it is recommended to set the maximum number of user processes, maxproc, to at least 2048, and the maximum number of open files, maxfiles, to 100000.
2.2. Run the Maven Plugin
The Maven plugin is executed by including a reference to the plugin inside your application’s pom.xml. When the application is built, the Maven plugin is executed and generates the reports for analysis.
To run the Maven plugin perform the following steps.
Include the following plugin inside your application’s
pom.xml:[...] <plugin> <groupId>org.jboss.windup.plugin</groupId> <artifactId>windup-maven-plugin</artifactId> <version>4.1.0.Final</version> <executions> <execution> <id>run-windup</id> <phase>package</phase> <goals> <goal>windup</goal> </goals> </execution> </executions> <configuration> <offlineMode>true</offlineMode> <windupVersion>4.1.0.Final</windupVersion> </configuration> </plugin> [...]-
offlineMode: Indicates to run in offline mode, disabling network features to improve performance. windupVersion: Version of MTA.The above example demonstrates the minimum required arguments. See MTA Maven Arguments for a detailed description of all available arguments.
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Build the project.
$ mvn clean install
- Access the generated reports.
2.3. Run the Maven Plugin with Multiple Modules
To use the Maven plugin in a project with multiple modules, place the configuration inside the parent’s pom.xml. During execution the Maven plugin will generate a single report that contains the analysis for the parent and any child modules.
It is strongly recommended to set inherited to false in multi-module projects; otherwise, the Maven plugin will be executed when each child is compiled, resulting in multiple executions of the Maven plugin against the child modules. Setting inherited to false results in each project being analyzed a single time and drastically decreased run times.
To run the Maven plugin in a project with multiple modules perform the following steps.
Include the following plugin inside the parent project’s
pom.xml. The following is a samplepom.xmlfor a parent module.<plugin> <groupId>org.jboss.windup.plugin</groupId> <artifactId>windup-maven-plugin</artifactId> <version>4.1.0.Final</version> <inherited>false</inherited> <executions> <execution> <id>run-windup</id> <phase>package</phase> <goals> <goal>windup</goal> </goals> </execution> </executions> <configuration> <input>${project.basedir}</input> <offlineMode>true</offlineMode> <windupHome>/PATH/TO/CLI/</windupHome> <windupVersion>4.1.0.Final</windupVersion> </configuration> </plugin>This
pom.xmldeviates from the one in Run the Maven Plugin by the following attributes:-
inherited: Defined at the plugin level, this attribute indicates whether or not this configuration should be used in child modules. Set tofalsefor performance improvements. -
input: Specifies the path to the directory containing the projects to be analyzed. This attribute defaults to{project.basedir}/src/main, and should be defined if the parent project does not have source code to analyze. windupHome: A path to an extracted copy of the MTA CLI. This attribute is optional, but is recommended as a performance improvement.The above example demonstrates a set of recommended arguments. See MTA Maven Arguments for a detailed description of all available arguments.
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Build the parent project. During the build process the Maven plugin will execute against all children in the project without further configuration.
$ mvn clean install
- Once completed, Access the generated reports as normal. This report contains the analysis for the parent and all children.
2.4. Access the Report
When you execute Migration Toolkit for Applications, the report is generated in the OUTPUT_REPORT_DIRECTORY that you specify using the outputDirectory argument in the pom.xml. Upon completion of the build, you will see the following message in the build log.
Windup report created: OUTPUT_REPORT_DIRECTORY/index.htmlThe output directory contains the following files and subdirectories:
OUTPUT_REPORT_DIRECTORY/ ├── index.html // Landing page for the report ├── EXPORT_FILE.csv // Optional export of data in CSV format ├── graph/ // Generated graphs used for indexing ├── reports/ // Generated HTML reports ├── stats/ // Performance statistics
See the Review the Reports section of the MTA CLI Guide for information on the MTA reports and how to use them to assess your migration or modernization effort.
