Package org.apache.tomcat.util.compat

Class JreCompat

  • public class JreCompat
extends java.lang.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 java.lang.reflect.Method setApplicationProtocolsMethod

      • getApplicationProtocolMethod

        protected static final java.lang.reflect.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()

      • isInstanceOfInaccessibleObjectException

        public boolean isInstanceOfInaccessibleObjectException​(java.lang.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​(javax.net.ssl.SSLParameters sslParameters,
                                    java.lang.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 java.lang.String getApplicationProtocol​(javax.net.ssl.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 java.io.IOException
        Disables caching for JAR URL connections. For Java 8 and earlier, this also disables caching for ALL URL connections.
        Throws:
        java.io.IOException - If a dummy JAR URLConnection can not be created

      • addBootModulePath

        public void addBootModulePath​(java.util.Deque<java.net.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 java.util.jar.JarFile jarFileNewInstance​(java.lang.String s)
                                               throws java.io.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:
        java.io.IOException - If an I/O error occurs creating the JarFile instance

      • jarFileNewInstance

        public java.util.jar.JarFile jarFileNewInstance​(java.io.File f)
                                         throws java.io.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:
        java.io.IOException - If an I/O error occurs creating the JarFile instance

      • jarFileIsMultiRelease

        public boolean jarFileIsMultiRelease​(java.util.jar.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()

      • canAcccess

        public boolean canAcccess​(java.lang.Object base,
                          java.lang.reflect.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​(java.lang.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+