Script to patch the classpath in a Weblogic Server config.xml file

patch_classpath.scala

// script to patch the classpath in a Welogic Server config.xml file

import scala.xml._
import java.io._

def patchClassPath(configFile: String, edit: (String) => String) {
  // inner function to apply the passed in edit function to the classpath
  def patch(node: Node): Node = {
    def patchElem(elem: Elem): Elem =
      elem.copy(child = elem.child.map(patch(_)))

    node match {
      case elem: Elem if elem.label == "domain" => patchElem(elem)
      case elem: Elem if elem.label == "server" => patchElem(elem)
      case elem: Elem if elem.label == "server-start" => patchElem(elem)
      case elem: Elem if elem.label == "class-path" =>
        elem.copy(child = Text(edit(elem.text)))
      case other @ _ => other
    }
  }

  /**
   * Returns the input XML node in a pretty print format String.
   */
  def format(node: Node): String = {
    val pp = new PrettyPrinter(Int.MaxValue, 2)

    val buf = new StringBuilder()
    buf.append("""<?xml version="1.0" encoding="UTF-8"?>""")
    buf.append("\n")
    buf.append(pp.format(node))
    buf.append("\n")
    buf.toString
  }

  val config = XML.loadFile(configFile)     // load the old config from file
  val patchedConfig = patch(config)         // patch it
  val writer = new PrintWriter(configFile)  // output it out to file
  writer.write(format(patchedConfig))
  writer.close
}

/**
 * Given a classpath for wls 10.3.5 returns the classpath with approriate
 * changes for wls 10.3.6
 */
def patch_classpath_wls_1035_to_1036(classpath: String): String = {
  val removes = List(  // remove these jars from the classpath
    "/opt/oracle/11g/patch_ocp360/profiles/default/sys_manifest_classpath/weblogic_patch.jar",
    "/opt/oracle/11g/patch_wls1035/profiles/default/sys_manifest_classpath/weblogic_patch.jar"
  )

  val replaces = Map(  // replace the 10.3.5.0 jar with 10.3.6.0 jar
    "/opt/oracle/11g/modules/features/weblogic.server.modules_10.3.5.0.jar" ->
    "/opt/oracle/11g/modules/features/weblogic.server.modules_10.3.6.0.jar"
  ).withDefault(x => x)

  val paths = classpath.split(':').toList.map(_.trim).filter(_.length > 0)
  paths.filter(s => !removes.contains(s)).map(replaces).mkString(":")
}

// START OF MAIN SCRIPT

def usage = {
  println("usage: scala patch_classpath.scala <configfile>")
  sys.exit
}

if (args.length != 1) usage

val configFile = args(0)
patchClassPath(configFile, patch_classpath_wls_1035_to_1036)