Each process, or "runtime", applies different constraints to the code that runs in that process.
For example, each process has different supported JVMs and a different set of services available for dependency injection.

      // Even though the contract in System.getProperties() specifies that a value will exist for
      // all of the listed keys, for some reason the "java.compiler" key returns null in some JVMs.
      if (property == JAVA_COMPILER) {
        continue;
      }
      // Removed in Java 9:
      // https://docs.oracle.com/javase/9/migrate/toc.htm#JSMIG-GUID-2C896CA8-927C-4381-A737-B1D81D964B7B

      // Even though the contract in System.getProperties() specifies that a value will exist for
      // all of the listed keys, for some reason the "java.compiler" key returns null in some JVMs.
      if (property == JAVA_COMPILER) {
        continue;
      }
      // Removed in Java 9:
      // https://docs.oracle.com/javase/9/migrate/toc.htm#JSMIG-GUID-2C896CA8-927C-4381-A737-B1D81D964B7B

     * Compares cipher suites names like "TLS_RSA_WITH_NULL_MD5" and "SSL_RSA_WITH_NULL_MD5",
     * ignoring the "TLS_" or "SSL_" prefix which is not consistent across platforms. In particular
     * some IBM JVMs use the "SSL_" prefix everywhere whereas Oracle JVMs mix "TLS_" and "SSL_".
     */
    internal val ORDER_BY_NAME =
      object : Comparator<String> {
        override fun compare(
          a: String,
          b: String,
        ): Int {

  // safely publish these objects and we won't need this whole discussion.
  // TODO(user,lukes): consider adding volatile to all these fields since in current known JVMs
  // that should resolve the issue. This comes at the cost of adding more write barriers to the
  // implementations.

  private Futures() {}

  /**

  // safely publish these objects and we won't need this whole discussion.
  // TODO(user,lukes): consider adding volatile to all these fields since in current known JVMs
  // that should resolve the issue. This comes at the cost of adding more write barriers to the
  // implementations.

  private Futures() {}

  /**

	// In Dalvik and ART, the jobject type in the JNI interface of the JVM has the
	// property that it is sometimes (always?) a small integer instead of a real pointer.
	// Note: although only the android JVMs are bad in this respect, we declare the JNI types
	// bad regardless of platform, so the same Go code compiles on both android and non-android.
	if parent, ok := jniTypes[dt.Name]; ok {