if (matcher.matches()) {
            String uid = matcher.group(1) == null ? null : matcher.group(1).substring("uid=".length());
            String javaHome = matcher.group(2);
            JavaLanguageVersion javaVersion = JavaLanguageVersion.of(matcher.group(3));
            String daemonRegistryDir = matcher.group(4);
            String pidStr = matcher.group(5);
            Long pid = pidStr.equals("null") ? null : Long.parseLong(pidStr);

plugins {
    java
}

java {
    toolchain { // <1>
        languageVersion = JavaLanguageVersion.of(8)
    }
}

tasks.register<CustomTaskUsingToolchains>("showDefaultToolchain") // <2>

tasks.register<CustomTaskUsingToolchains>("showCustomToolchain") {
    launcher = javaToolchains.launcherFor { // <3>
        languageVersion = JavaLanguageVersion.of(17)
    }
}

package org.gradle.jvm.toolchain.internal;

import org.gradle.internal.jvm.Jvm;
import org.gradle.jvm.toolchain.JavaLanguageVersion;

import javax.inject.Inject;

public abstract class CurrentJvmToolchainSpec extends DefaultToolchainSpec {

    @Inject
    public CurrentJvmToolchainSpec() {
        getLanguageVersion().set(JavaLanguageVersion.of(Jvm.current().getJavaVersion().getMajorVersion()));

        // disallow changing property values

    def 'fails when requesting not available toolchain'() {
        buildFile << """
            apply plugin: 'java'

            java {
                toolchain {
                    languageVersion = JavaLanguageVersion.of(99)
                }
            }
        """

        when:
        failure = executer
            .withToolchainDetectionEnabled()
            .withTasks("compileJava")

 * limitations under the License.
 */

package org.gradle.jvm.toolchain.internal

import org.gradle.jvm.toolchain.JavaLanguageVersion
import spock.lang.Specification

class DefaultJavaLanguageVersionTest extends Specification {

    def 'defines known versions'() {
        given:
        JavaLanguageVersion[] knownVersions = DefaultJavaLanguageVersion.KNOWN_VERSIONS

        expect:

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.gradle.integtests.fixtures.daemon


import org.gradle.jvm.toolchain.JavaLanguageVersion
import org.gradle.launcher.daemon.context.DaemonContext
import org.gradle.util.GradleVersion
import spock.lang.Specification

class DaemonContextParserTest extends Specification {

 *
 * @since 6.7
 */
public interface JavaInstallationMetadata {
    /**
     * Returns the language version of the JVM to which this tool belongs
     *
     * @return the {@code JavaLanguageVersion}
     */
    @Input
    JavaLanguageVersion getLanguageVersion();

    /**
     * Returns the full Java version (including the build number) of the JVM, as specified in its {@code java.runtime.version} property.
     *

 * limitations under the License.
 */
package org.gradle.launcher.daemon.server


import org.gradle.internal.remote.Address
import org.gradle.jvm.toolchain.JavaLanguageVersion
import org.gradle.launcher.daemon.configuration.DaemonParameters
import org.gradle.launcher.daemon.context.DaemonContext
import org.gradle.launcher.daemon.context.DefaultDaemonContext

plugins {
    id 'java'
}

// tag::toolchain[]
java {
    toolchain {
        languageVersion = JavaLanguageVersion.of(17)
    }
}

plugins {
    id 'java'
}

java {
    toolchain {
        languageVersion = JavaLanguageVersion.of(11)
    }