Package org.fbsql.servlet

Class ClassLoaderUtils

java.lang.Object

javax.servlet.GenericServlet

javax.servlet.http.HttpServlet

org.fbsql.servlet.ClassLoaderUtils

All Implemented Interfaces:

java.io.Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig

public class ClassLoaderUtils
extends javax.servlet.http.HttpServlet

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
ClassLoaderUtils()

Method Summary

Modifier and Type	Method	Description
(package private) static java.lang.ClassLoader	createClassLoader(java.util.List<java.lang.String> jars)	Load JDBC driver class from jar files specified as value of "jdbc.jars" property name in configuration file Value "jdbc.jars" must contains comma-separated JARs file names or URLs
static void	registerJdbcDriver(java.lang.String jdbcDriverClassName, java.util.List<java.lang.String> driverJars)	Register JDBC driver DriverManager will refuse to use a driver not loaded by the system ClassLoader The workaround for this is to use a shim class that implements java.sql.Driver.

Methods inherited from class javax.servlet.http.HttpServlet

doDelete, doGet, doHead, doOptions, doPost, doPut, doTrace, getLastModified, service, service

Methods inherited from class javax.servlet.GenericServlet

destroy, getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, init, log, log

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ClassLoaderUtils

public ClassLoaderUtils()

Method Detail

createClassLoader

static java.lang.ClassLoader createClassLoader(java.util.List<java.lang.String> jars)

Load JDBC driver class from jar files specified as value of "jdbc.jars" property name in configuration file Value "jdbc.jars" must contains comma-separated JARs file names or URLs

Parameters:

array - of JAR files

Returns:

custom URL ClassLoader based on specified JAR files

registerJdbcDriver

public static void registerJdbcDriver(java.lang.String jdbcDriverClassName,
                                      java.util.List<java.lang.String> driverJars)
                               throws java.lang.InstantiationException,
                                      java.lang.IllegalAccessException,
                                      java.lang.IllegalArgumentException,
                                      java.lang.reflect.InvocationTargetException,
                                      java.lang.NoSuchMethodException,
                                      java.lang.SecurityException,
                                      java.sql.SQLException,
                                      java.lang.ClassNotFoundException

Register JDBC driver DriverManager will refuse to use a driver not loaded by the system ClassLoader The workaround for this is to use a shim class that implements java.sql.Driver. This shim class will do nothing but call the methods of an instance of a JDBC driver that is loaded dynamically. This works because DriverShim is loaded by the system class loader, and DriverManager doesn't care that it invokes a class that wasn't.

Parameters:

jars - value of "jdbc.jars" property name in configuration file

classLoader - custom URL ClassLoader

Throws:

java.lang.InstantiationException

java.lang.IllegalAccessException

java.lang.IllegalArgumentException

java.lang.reflect.InvocationTargetException

java.lang.NoSuchMethodException

java.lang.SecurityException

java.sql.SQLException

java.lang.ClassNotFoundException

See Also:

DriverShim