Class JreCompat

  • Direct Known Subclasses:
    Jre19Compat

    public class JreCompat
    extends Object
    This is the base implementation class for JRE compatibility and provides an implementation based on Java 8. Sub-classes may extend this class and provide alternative implementations for later JRE versions
    • Field Detail

      • setApplicationProtocolsMethod

        protected static final Method setApplicationProtocolsMethod
      • getApplicationProtocolMethod

        protected static final Method getApplicationProtocolMethod
    • Constructor Detail

      • JreCompat

        public JreCompat()
    • Method Detail

      • getInstance

        public static JreCompat getInstance()
      • isGraalAvailable

        public static boolean isGraalAvailable()
      • isAlpnSupported

        public static boolean isAlpnSupported()
      • isJre9Available

        public static boolean isJre9Available()
      • isJre11Available

        public static boolean isJre11Available()
      • isJre16Available

        public static boolean isJre16Available()
      • isJre19Available

        public static boolean isJre19Available()
      • isInstanceOfInaccessibleObjectException

        public boolean isInstanceOfInaccessibleObjectException​(Throwable t)
        Test if the provided exception is an instance of java.lang.reflect.InaccessibleObjectException.
        Parameters:
        t - The exception to test
        Returns:
        true if the exception is an instance of InaccessibleObjectException, otherwise false
      • setApplicationProtocols

        public void setApplicationProtocols​(SSLParameters sslParameters,
                                            String[] protocols)
        Set the application protocols the server will accept for ALPN
        Parameters:
        sslParameters - The SSL parameters for a connection
        protocols - The application protocols to be allowed for that connection
      • getApplicationProtocol

        public String getApplicationProtocol​(SSLEngine sslEngine)
        Get the application protocol that has been negotiated for connection associated with the given SSLEngine.
        Parameters:
        sslEngine - The SSLEngine for which to obtain the negotiated protocol
        Returns:
        The name of the negotiated protocol
      • disableCachingForJarUrlConnections

        public void disableCachingForJarUrlConnections()
                                                throws IOException
        Disables caching for JAR URL connections. For Java 8 and earlier, this also disables caching for ALL URL connections.
        Throws:
        IOException - If a dummy JAR URLConnection can not be created
      • addBootModulePath

        public void addBootModulePath​(Deque<URL> classPathUrlsToProcess)
        Obtains the URLs for all the JARs on the module path when the JVM starts and adds them to the provided Deque.
        Parameters:
        classPathUrlsToProcess - The Deque to which the modules should be added
      • jarFileNewInstance

        public final JarFile jarFileNewInstance​(String s)
                                         throws IOException
        Creates a new JarFile instance. When running on Java 9 and later, the JarFile will be multi-release JAR aware. While this isn't strictly required to be in this package, it is provided as a convenience method.
        Parameters:
        s - The JAR file to open
        Returns:
        A JarFile instance based on the provided path
        Throws:
        IOException - If an I/O error occurs creating the JarFile instance
      • jarFileNewInstance

        public JarFile jarFileNewInstance​(File f)
                                   throws IOException
        Creates a new JarFile instance. When running on Java 9 and later, the JarFile will be multi-release JAR aware.
        Parameters:
        f - The JAR file to open
        Returns:
        A JarFile instance based on the provided file
        Throws:
        IOException - If an I/O error occurs creating the JarFile instance
      • jarFileIsMultiRelease

        public boolean jarFileIsMultiRelease​(JarFile jarFile)
        Is this JarFile a multi-release JAR file.
        Parameters:
        jarFile - The JarFile to test
        Returns:
        true If it is a multi-release JAR file and is configured to behave as such.
      • jarFileRuntimeMajorVersion

        public int jarFileRuntimeMajorVersion()
      • canAccess

        public boolean canAccess​(Object base,
                                 AccessibleObject accessibleObject)
        Is the accessibleObject accessible (as a result of appropriate module exports) on the provided instance?
        Parameters:
        base - The specific instance to be tested.
        accessibleObject - The method/field/constructor to be tested.
        Returns:
        {code true} if the AccessibleObject can be accessed otherwise {code false}
      • isExported

        public boolean isExported​(Class<?> type)
        Is the given class in an exported package?
        Parameters:
        type - The class to test
        Returns:
        Always true for Java 8. true if the enclosing package is exported for Java 9+
      • getModuleName

        public String getModuleName​(Class<?> type)
        What is the module of the given class?
        Parameters:
        type - The class to test
        Returns:
        Always true for Java 8. true if the enclosing package is exported for Java 9+
      • getUnixDomainSocketAddress

        public SocketAddress getUnixDomainSocketAddress​(String path)
        Return Unix domain socket address for given path.
        Parameters:
        path - The path
        Returns:
        the socket address
      • openUnixDomainServerSocketChannel

        public ServerSocketChannel openUnixDomainServerSocketChannel()
        Create server socket channel using the Unix domain socket ProtocolFamily.
        Returns:
        the server socket channel
      • openUnixDomainSocketChannel

        public SocketChannel openUnixDomainSocketChannel()
        Create socket channel using the Unix domain socket ProtocolFamily.
        Returns:
        the socket channel