Java – How to enable the preview language features?
This article shows you how to use --enable-preview
to enable the preview language features in Java 12, 13 and above.
Note
Read this JEP 12: Preview Language and VM Features
Read this JEP 12: Preview Language and VM Features
P.S All preview features are disabled by default.
On JDK 12:
# compile
javac Example.java // Do not enable any preview features
javac --release 12 --enable-preview Example.java // Enable all preview features of JDK 12
javac --release 11 --enable-preview Example.java // DISALLOWED
#Run
java --enable-preview Example // Run with preview features of JDK 12
On JDK 13:
javac Example.java // Do not enable any preview features
javac --release 13 --enable-preview Example.java // Enable all preview features of JDK 13
javac --release 12 --enable-preview Example.java // DISALLOWED
java --enable-preview Example // Run with preview features of JDK 13
1. Maven
Enable preview features in Maven.
pom.xml
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
<configuration>
<!-- 1.10, 11, 12, 13-->
<release>13</release>
<compilerArgs>
--enable-preview
</compilerArgs>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>3.0.0-M3</version>
<configuration>
<argLine>--enable-preview</argLine>
</configuration>
</plugin>
</plugins>
</build>
2. Gradle
For Java 12, enable preview features in Gradle.
tasks.withType(JavaCompile).each {
it.options.compilerArgs.add('--enable-preview')
}
test {
jvmArgs(['--enable-preview'])
}
Note
Gradle 5.6.2 and below is not working with the latest Java 13, see this issue , wait Gradle 6.0 to fix it.
Gradle 5.6.2 and below is not working with the latest Java 13, see this issue , wait Gradle 6.0 to fix it.
References
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