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Appendix A. Reference material
A.1. About Maven Plugin arguments
The following is a detailed description of the available MTR Maven plugin arguments.
| Argument | Description |
|---|---|
| analyzeKnownLibraries | Flag to analyze known software artifacts embedded within your application. By default, MTR only analyzes application code. Note This option may result in a longer execution time and a large number of migration issues being reported. |
| customLoggingPropertiesFile |
An absolute path to a |
| disableTattletale |
Flag to disable generation of the Tattletale report. If both |
| enableCompatibleFilesReport | Flag to enable generation of the Compatible Files report. Due to processing all files without found issues, this report may take a long time for large applications. |
| enableTattletale |
Flag to enable generation of a Tattletale report for each application. This option is enabled by default when |
| enableTransactionAnalysis |
[Technology Preview] Flag to enable generation of a Transactions report that displays the call stack, which executes operations on relational database tables. The Enable Transaction Analysis feature supports Spring Data JPA and the traditional Note enableTransactionAnalysis is a Technology Preview feature only. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process. |
| excludePackages | A list of packages to exclude from evaluation. For example, entering "com.mycompany.commonutilities" would exclude all classes whose package name begins with "com.mycompany.commonutilities". |
| excludeTags | A list of tags to exclude. When specified, rules with these tags will not be processed. |
| explodedApps | Flag to indicate that the provided input directory contains source files for a single application. |
| exportCSV |
Flag to export the report data to a CSV file on your local file system. MTR creates the file in the directory specified by the |
| includeTags | A list of tags to use. When specified, only rules with these tags will be processed. |
| inputDirectory |
Specify the path to the directory containing the applications to be analyzed. This argument defaults to |
| keepWorkDirs | Flag to instruct MTR to not delete temporary working files, such as the graph database and unzipped archives. This is useful for debugging purposes. |
| packages | A list of the packages to be evaluated by MTR. This argument is required. |
| offlineMode | Flag to operate in offline mode, disabling network access features, such as scheme validation. Used to improve performance. |
| outputDirectory |
Specify the path to the directory to output the report information generated by MTR. This argument defaults to |
| overwrite |
Flag to force delete the existing output directory specified by Warning Be careful not to specify a report output directory that contains important information! |
| sourceTechnologies |
A list of one or more source technologies, servers, platforms, or frameworks to migrate from. This argument, in conjunction with the |
| sourceMode |
Flag to indicate that the application to be evaluated contains source files rather than compiled binaries. Defaults to |
| targetTechnologies |
A list of one or more target technologies, servers, platforms, or frameworks to migrate to. This argument, in conjunction with the |
| userIgnorePath | Specify a location for MTR to identify files that should be ignored. |
| userRulesDirectory |
Specify a location for MTR to look for custom MTR rules. The value can be a directory containing ruleset files or a single ruleset file. The ruleset files must use the |
| windupHome | An optional argument that points to the root of an extracted MTR CLI. By referencing a local installation of the CLI, the Maven plugin has direct access to all of the indexes, resulting in a performance increase. |
| windupVersion | Specify the version of MTR to run. By default, this is the Maven plugin’s build version. |
A.1.1. Specifying the input directory
A path to the file or directory containing one or more applications to be analyzed. This defaults to {project.basedir}/src/main/.
Usage
<inputDirectory>
<INPUT_ARCHIVE_OR_DIRECTORY>
</inputDirectory>
A.1.2. Evaluating an input file
Depending on whether the input file type provided to the inputDirectory argument is a file or directory, it will be evaluated as follows depending on the additional arguments provided.
- Directory
--explodedApp --sourceMode Neither Argument The directory is evaluated as a single application.
The directory is evaluated as a single application.
Each subdirectory is evaluated as an application.
- File
--explodedApp --sourceMode Neither Argument Argument is ignored; the file is evaluated as a single application.
The file is evaluated as a compressed project.
The file is evaluated as a single application.
A.1.3. Specifying the output directory
Specify the path to the directory to output the report information generated by MTR.
Usage
<outputDirectory>
<OUTPUT_REPORT_DIRECTORY>
</outputDirectory>
-
If omitted, the report will be generated in the
{project.build.directory}/windup-reportdirectory. -
If the output directory exists, it will be overwritten based on the value of the
overwriteargument. This argument defaults totrue, and causes MTR to delete and recreate the directory.
A.1.4. Setting the source technology
A list of one or more source technologies, servers, platforms, or frameworks to migrate from. This argument, in conjunction with the targetTechnologies argument, helps to determine which rulesets are used.
Usage
<sourceTechnologies>
<source>eap:6</source>
</sourceTechnologies>
The sourceTechnologies argument now provides version support, which follows the Maven version range syntax. This instructs MTR to only run the rulesets matching the specified versions. For example, <source>eap:5</source>.
A.1.5. Setting the target argument
A list of one or more target technologies, servers, platforms, or frameworks to migrate to. This argument, in conjunction with the sourceTechnologies argument, helps to determine which rulesets are used. This argument is required
Usage
<targetTechnologies> <target>eap:7</target> </targetTechnologies>
The targetTechnologies argument now provides version support, which follows the Maven version range syntax. This instructs MTR to only run the rulesets matching the specified versions. For example, <target>eap:7</target>.
When migrating to JBoss EAP, be sure to specify the version in the target, for example, eap:6. Specifying only eap will run rulesets for all versions of JBoss EAP, including those not relevant to your migration path.
See Supported migration paths in Introduction to the Migration Toolkit for Runtimes for the appropriate JBoss EAP version.
A.1.6. Selecting packages
A list of the packages to be evaluated by MTR. It is highly recommended to use this argument.
Usage
<packages>
<package>
<PACKAGE_1>
</package>
<package>
<PACKAGE_2>
</package>
</packages>
In most cases, you are interested only in evaluating custom application class packages and not standard Java EE or third party packages. The
<PACKAGE_N>argument is a package prefix; all subpackages will be scanned. For example, to scan the packagescom.mycustomappandcom.myotherapp, use the following snippet in yourpom.xml.<packages> <package>com.mycustomapp</package> <package>com.myotherapp</package> </packages>
-
While you can provide package names for standard Java EE third party software like
org.apache, it is usually best not to include them as they should not impact the migration effort.
A.2. Default logging properties
The default logging.properties file included with the Maven plugin is provided below. This configuration omits many extraneous messages while allowing you to view the progress of the Maven plugin.
Default logging.properties file
# Licensed under the Eclipse Public License version 1.0, available at # http://www.eclipse.org/legal/epl-v10.html # # Additional loggers to configure (the root logger is always configured) #loggers= handlers=java.util.logging.ConsoleHandler .level=INFO #java.util.logging.ConsoleHandler.level=INFO #loggers=org.jboss.forge,org.jboss.weld,org.xnio,org.jboss.forge,org.ocpsoft.rewrite,org.jboss.windup.graph.GraphModelScanner,org.jboss.windup.reporting.xml.ClassificationHandler,org.jboss.windup.graph.GraphTyp$ org.jboss.forge.level=SEVERE org.janusgraph.level=SEVERE org.janusgraph.diskstorage.berkeleyje.BerkeleyJEKeyValueStore.level=SEVERE org.janusgraph.diskstorage.berkeleyje.level=SEVERE org.jboss.weld.level=SEVERE org.xnio.level=SEVERE org.jboss.forge.level=SEVERE org.ocpsoft.rewrite.level=SEVERE org.jboss.windup.graph.GraphModelScanner.level=SEVERE org.jboss.windup.reporting.xml.ClassificationHandler.level=SEVERE org.jboss.windup.graph.GraphTypeManager.level=SEVERE org.jboss.windup.graph.GraphContextImpl.level=SEVERE org.jboss.windup.rules.files.FileMapping.level=SEVERE org.jboss.windup.exec.level=SEVERE org.jboss.windup.config.level=SEVERE com.thinkaurelius.level=SEVERE org.jboss.windup=INFO
A.3. About rule story points
A.3.1. What are story points?
Story points are an abstract metric commonly used in Agile software development to estimate the level of effort needed to implement a feature or change.
The Migration Toolkit for Runtimes uses story points to express the level of effort needed to migrate particular application constructs, and the application as a whole. It does not necessarily translate to man-hours, but the value should be consistent across tasks.
A.3.2. How story points are estimated in rules
Estimating the level of effort for the story points for a rule can be tricky. The following are the general guidelines MTR uses when estimating the level of effort required for a rule.
| Level of Effort | Story Points | Description |
|---|---|---|
| Information | 0 | An informational warning with very low or no priority for migration. |
| Trivial | 1 | The migration is a trivial change or a simple library swap with no or minimal API changes. |
| Complex | 3 | The changes required for the migration task are complex, but have a documented solution. |
| Redesign | 5 | The migration task requires a redesign or a complete library change, with significant API changes. |
| Rearchitecture | 7 | The migration requires a complete rearchitecture of the component or subsystem. |
| Unknown | 13 | The migration solution is not known and may need a complete rewrite. |
A.3.3. Task category
In addition to the level of effort, you can categorize migration tasks to indicate the severity of the task. The following categories are used to group issues to help prioritize the migration effort.
- Mandatory
- The task must be completed for a successful migration. If the changes are not made, the resulting application will not build or run successfully. Examples include replacement of proprietary APIs that are not supported in the target platform.
- Optional
- If the migration task is not completed, the application should work, but the results may not be optimal. If the change is not made at the time of migration, it is recommended to put it on the schedule soon after your migration is completed. An example of this would be the upgrade of EJB 2.x code to EJB 3.
- Potential
- The task should be examined during the migration process, but there is not enough detailed information to determine if the task is mandatory for the migration to succeed. An example of this would be migrating a third-party proprietary type where there is no directly compatible type.
- Information
-
The task is included to inform you of the existence of certain files. These may need to be examined or modified as part of the modernization effort, but changes are typically not required. An example of this would be the presence of a logging dependency or a Maven
pom.xml.
For more information on categorizing tasks, see Using custom rule categories.
A.4. Additional resources
A.4.1. Getting involved
To help the Migration Toolkit for Runtimes cover most application constructs and server configurations, including yours, you can help with any of the following items.
- Send an email to jboss-migration-feedback@redhat.com and let us know what MTR migration rules should cover.
- Provide example applications to test migration rules.
Identify application components and problem areas that may be difficult to migrate.
- Write a short description of these problem migration areas.
- Write a brief overview describing how to solve the problem migration areas.
- Try Migration Toolkit for Runtimes on your application. Be sure to report any issues you encounter.
Contribute to the Migration Toolkit for Runtimes rules repository.
- Write a Migration Toolkit for Runtimes rule to identify or automate a migration process.
- Create a test for the new rule.
- Details are provided in the Rules Development Guide.
Contribute to the project source code.
- Create a core rule.
- Improve MTR performance or efficiency.
Any level of involvement is greatly appreciated!
A.4.2. Resources
- MTR forums: https://developer.jboss.org/en/windup
- Jira issue tracker: https://issues.redhat.com/projects/WINDUP
- MTR mailing list: jboss-migration-feedback@redhat.com
A.4.3. Reporting issues
MTR uses Jira as its issue tracking system. If you encounter an issue executing MTR, submit a Jira issue.
Revised on 2023-03-16 15:54:33 UTC
