import org.apache.maven.api.annotations.Experimental;

/**
 * Represents a Java toolchain in the Maven build system.
 *
 * <p>A Java toolchain is a specific type of toolchain that provides access
 * to Java development tools, such as the Java compiler and Java runtime
 * environment. This interface allows users to define and configure
 * Java-related toolchains that can be utilized during the build process
 * in Maven.</p>
 *

    public MavenExecutionRequest populateFromToolchains(MavenExecutionRequest request, PersistedToolchains toolchains)
            throws MavenExecutionRequestPopulationException {
        if (toolchains != null) {
            Map<String, List<ToolchainModel>> groupedToolchains = new HashMap<>(2);

            for (ToolchainModel model : toolchains.getToolchains()) {
                if (!groupedToolchains.containsKey(model.getType())) {

    @Test
    void testNoProblems() {
        ToolchainsBuildingException e = new ToolchainsBuildingException(Collections.<Problem>emptyList());
        assertEquals("0 problems were encountered while building the effective toolchains" + LS, e.getMessage());
    }

    @Test
    void testOneProblem() {
        ProblemCollector problemCollector = ProblemCollectorFactory.newInstance(null);

maven.user.settings         = ${maven.user.conf}/settings.xml

#
# Toolchains
#
# Define the default three levels for toolchains.
# The '-it' flag will override the 'maven.installation.toolchains' property.
# The '-t' flag will override the 'maven.user.toolchains' property.
maven.installation.toolchains = ${maven.installation.conf}/toolchains.xml
maven.user.toolchains         = ${maven.user.conf}/toolchains.xml

#
# Extensions
#

                    .longOpt("toolchains")
                    .desc("Alternate path for the user toolchains file")
                    .hasArg()
                    .build());
            options.addOption(Option.builder(ALTERNATE_INSTALLATION_TOOLCHAINS)
                    .longOpt("install-toolchains")
                    .desc("Alternate path for the installation toolchains file")
                    .hasArg()

 -----
 2006-11-04
 -----

Maven 4 API - Immutable Toolchains Model

 This is strictly the immutable model for Maven toolchains in <<<org.apache.maven.api.toolchain>>> package.

 The following are generated from this model:

   * {{{./apidocs/index.html}Java sources}} with <<<Builder>>> inner classes for immutable instances creation.

 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.toolchain.building;

import java.util.List;

import org.apache.maven.building.Problem;
import org.apache.maven.toolchain.model.PersistedToolchains;

/**
 * Collects the output of the toolchains builder.
 *
 * @since 3.3.0
 * @deprecated since 4.0.0, use {@link org.apache.maven.api.services.ToolchainsBuilder} instead

specific language governing permissions and limitations
under the License.
-->

<toolchains>
  <toolchain>
     <type>basic</type>
     <configuration>
       <user>true</user>
     </configuration>
  </toolchain>
  <toolchain>
     <type>rare</type>
     <configuration>
       <user>true</user>
     </configuration>
  </toolchain>

            -->
            <execution>
              <id>download-11</id>
              <goals>
                <goal>toolchain</goal>
              </goals>
              <configuration>
                <toolchains>
                  <jdk>
                    <version>11</version>
                    <vendor>zulu</vendor>
                  </jdk>
                </toolchains>

            -->
            <execution>
              <id>download-11</id>
              <goals>
                <goal>toolchain</goal>
              </goals>
              <configuration>
                <toolchains>
                  <jdk>
                    <version>11</version>
                    <vendor>zulu</vendor>
                  </jdk>
                </toolchains>