Many of these APIs were deprecated in previous releases and The resulting HTML file displays the description, resolution and issue location: 1.1 Removed API Back to Content The README file describes all available options for analyzing classes and JAR files.

sh scripts in the bin directory of the extracted archive may be used to start the command line analysis. This analyzes the class files in the specified directory and displays potential issues when upgrading from Java 8 to Java 17 in the java8to17.html file. o java8to17.html /home/user/application/classes For example, from the command line: java -cp 'lib/analysis/*' .AnalysisMain -f 8 -t 17 Inside the extracted directory the analysis can be started. zip file in the emt4j-assembly/target directory which may be extracted. To demonstrate EMT4J, consider the following example application that makes a call to the Thread.stop() method that was removed in Java 11: Thread thread = new Thread() Īfter cloning the Git repository and configuring the Maven toolchains for JDK 8 and JDK 11, the project may be build with: mvn clean package -Prelease This includes functionality such as the removal of Nashorn, J2EE and Java packages, a change in APIs and access to the Java internals that have become more restricted.ĮMT4J offers a Maven plugin ( not yet available on Maven central), Java agent and command-line solution to analyze project incompatibilities with new Java versions and the output is written as TXT, JSON or HTML formats. Upgrading an application to a new Java version means developers need to resolve all the issues introduced by the changes and removals inside Java. For example, in 2022, four years after its release, Java 11 was used by less than 49 percent of the Java applications. Unfortunately, adoption of new Java versions is relatively slow. In the meantime, Long Term Support (LTS) Java versions will be released every two years and projects such as Spring Framework 6 now require Java 17. Organizations advise keeping the Java runtime up-to-date to get security and functional improvements.

EMT4J will support upgrading to future LTS versions. Adoptium has introduced the Eclipse Migration Toolkit for Java (EMT4J), an open source Eclipse project capable of analyzing and upgrading applications from Java 8 to Java 11 and from Java 11 to Java 17.

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