Get library from properties file

custom-tasks.gradle

task persistApplicationProperties(type: Task){
    description "Persists the version of the library in version.properties so it can be accessed at run time in " +
            "/commercetools-sync-java/src/main/java/com/commercetools/sync/commons/utils/SyncSolutionInfo.java"
    String libVersion = rootProject.version
    String libName = "commercetools-sync-java"
    String propertiesFilePath = "src/main/resources/application.properties"
    if (!rootProject || !(rootProject.version?.trim())) {
        throw new InvalidUserDataException("Please, specify rootProject.version field.")
    } else {
        Properties props = new Properties()
        File propsFile = new File(propertiesFilePath)
        props.load(propsFile.newDataInputStream())
        /*props.setProperty('name', libName)
        props.setProperty('version', libVersion)*/
        props.store(propsFile.newWriter(), null)
    }
}

execution-order.gradle

compileJava.dependsOn persistApplicationProperties

SyncSolutionInfo.java

 public class SyncSolutionInfo extends SolutionInfo {
     static final String UNSPECIFIED = "unspecified";
-
+    static final String LIBRARY_PROPERTIES = "application.properties";
+    static final String LIBRARY_NAME_PROPERTY = "name";
+    static final String LIBRARY_VERSION_PROPERTY = "version";

       public SyncSolutionInfo() throws IOException, IllegalArgumentException {
        final InputStream propertiesStream = SyncSolutionInfo.class.getClassLoader()
                                                                   .getResourceAsStream(LIBRARY_PROPERTIES);
        if (propertiesStream != null) {
            final Properties libProperties = new Properties();
            libProperties.load(propertiesStream);
            setName(getPropertyValueOrThrow(libProperties, LIBRARY_NAME_PROPERTY));
            setVersion(getPropertyValueOrThrow(libProperties, LIBRARY_VERSION_PROPERTY));
        } else {
            throw
                new IllegalArgumentException(format("Library properties file (%s) doesn't exist. Cannot fetch library "
                    + "properties at runtime.", LIBRARY_PROPERTIES));
        }
    }

       private static String getPropertyValueOrThrow(@Nonnull final Properties properties,
                                                  @Nonnull final String propertyKey) throws IllegalArgumentException {
        return Optional.ofNullable(properties.getProperty(propertyKey))
                       .orElseThrow(() ->
                           new IllegalArgumentException("Missing property value '" + propertyKey + "'.\n"));
    }
}