Red Hat Training

A Red Hat training course is available for Red Hat Application Migration Toolkit

Chapter 2. Getting Started

2.1. Prerequisites

Before installing the CLI, verify that you meet the following prerequisites.

  • Java Platform, JRE version 8+
  • A minimum of 4 GB RAM; 8 GB recommended
Note

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. Install the CLI

  1. Download the CLI from the RHAMT Download page.
  2. Extract the ZIP file to a directory of your choice.

The extracted directory is known as RHAMT_HOME in this guide.

2.3. Run the CLI

Use the following steps to run RHAMT against your application.

  1. Open a terminal and navigate to the RHAMT_HOME/bin/ directory.

  2. Execute the rhamt-cli script, or rhamt-cli.bat for Windows, and specify the appropriate arguments. 

    $ ./rhamt-cli --input /path/to/jee-example-app-1.0.0.ear --output /path/to/output --source weblogic --target eap:6 --packages com.acme org.apache
    • --input: The application to be evaluated. See the --input argument description.
    • --output: The output directory for the generated reports. See the --output argument description.
    • --source: The source technology for the application migration. See the --source argument description.
    • --target: The target technology for the application migration. See the --target argument description.
    • --packages: The packages to be evaluated. This argument is highly recommended to improve performance. See the --packages argument description.

    See RHAMT Command-line Arguments for a detailed description of all available command-line arguments.

  3. Access the report.

See RHAMT Command Examples below for examples of commands that use source code directories and archives located in the RHAMT GitHub repository.

RHAMT Command Examples

Running RHAMT on an Application Archive

The following command analyzes the com.acme and org.apache packages of the jee-example-app-1.0.0.ear example EAR archive for migrating from JBoss EAP 5 to JBoss EAP 7. 

$ RHAMT_HOME/bin/rhamt-cli --input /path/to/jee-example-app-1.0.0.ear --output /path/to/report-output/ --source eap:5 --target eap:7 --packages com.acme org.apache
Running RHAMT on Source Code

The following command analyzes the org.jboss.seam packages of the seam-booking-5.2 example source code for migrating to JBoss EAP 6. 

$ RHAMT_HOME/bin/rhamt-cli --sourceMode --input /path/to/seam-booking-5.2/ --output /path/to/report-output/ --target eap:6 --packages org.jboss.seam
Running Cloud-readiness Rules

The following command analyzes the com.acme and org.apache packages of the jee-example-app-1.0.0.ear example EAR archive for migrating to JBoss EAP 7. It also evaluates for cloud readiness. 

$ RHAMT_HOME/bin/rhamt-cli --input /path/to/jee-example-app-1.0.0.ear --output /path/to/report-output/ --target eap:7 --target cloud-readiness --packages com.acme org.apache
Override RHAMT Properties

To override the default Fernflower decompiler, pass the -Dwindup.decompiler argument on the command line. For example, to use the Procyon decompiler, use the following syntax: 

$ RHAMT_HOME/bin/rhamt-cli -Dwindup.decompiler=procyon --input INPUT_ARCHIVE_OR_DIRECTORY --output OUTPUT_REPORT_DIRECTORY --target TARGET_TECHNOLOGY --packages PACKAGE_1 PACKAGE_2

RHAMT CLI Bash Completion

The RHAMT CLI provides an option to enable bash completion for Linux systems, allowing the RHAMT command-line arguments to be auto completed by pressing Tab when entering the commands. For instance, when bash completion is enabled, entering the following displays a list of available arguments. 

$ RHAMT_HOME/bin/rhamt-cli [TAB]
Enable Bash Completion

To enable bash completion for the current shell, execute the following command. After the prompt returns, follow the steps in Run the CLI. 

$ source RHAMT_HOME/bash-completion/rhamt-cli
Enable Persistent Bash Completion

The following commands allow bash completion to persist across restarts; however, if bash completion is desired for the current shell then the steps in Enable Bash Completion must be followed.

  • To enable bash completion for a specific user across system restarts, include the following line in that user’s ~/.bashrc file. 

    source RHAMT_HOME/bash-completion/rhamt-cli

  • To enable bash completion for all users across system restarts, copy the Red Hat Application Migration Toolkit CLI bash completion file to the /etc/bash_completion.d/ directory. By default, this directory is only writable by the root user. 

    # cp RHAMT_HOME/bash-completion/rhamt-cli /etc/bash_completion.d/

RHAMT Help

To see the complete list of available arguments for the rhamt-cli command, open a terminal, navigate to the RHAMT_HOME directory, and execute the following command: 

$ RHAMT_HOME/bin/rhamt-cli --help

2.4. Access the Report

When you execute Red Hat Application Migration Toolkit, the report is generated in the OUTPUT_REPORT_DIRECTORY that you specify using the --output argument in the command line. Upon completion of execution, you will see the following message in the terminal with the location of the report. 

Report created: OUTPUT_REPORT_DIRECTORY/index.html
              Access it at this URL: file:///OUTPUT_REPORT_DIRECTORY/index.html

The 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
├── archives/           // Archives extracted from the application
├── mavenized/          // Optional Maven project structure
├── reports/            // Generated HTML reports
├── stats/              // Performance statistics

Use a browser to open the index.html file located in the report output directory. See Review the Reports for information on navigating the RHAMT reports.