Resolve classes correctly

[jd9999]

am having trouble at the moment with imports in javassist. I had a look at the Javassist Tutorial, where it said I should use the importPackages(String packagename) method, but when I tried that I am still getting the same error. However, it also says it doesn't affect the get(String classname) method, as I have been using.

My error is this:

[source error] no such class: String  
javassist.CtNewMethod.make(CtNewMethod.java:79) 
javassist.CtNewMethod.make(CtNewMethod.java:45) 
RainbowBansTransAgent.Transformationer.transform(Transformationer.java:30) 
RainbowBansTransAgent.Transformationer.transform(Transformationer.java:105) 
sun.instrument.TransformerManager.transform(Unknown Source) 
sun.instrument.InstrumentationImpl.transform(Unknown Source) 
sun.instrument.InstrumentationImpl.retransformClasses0(Native Method) 
sun.instrument.InstrumentationImpl.retransformClasses(Unknown Source) 
RainbowBansTransAgent.TransAgent.premain(TransAgent.java:106) 
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
java.lang.reflect.Method.invoke(Unknown Source) 
sun.instrument.InstrumentationImpl.loadClassAndStartAgent(Unknown Source) 
sun.instrument.InstrumentationImpl.loadClassAndCallPremain(Unknown Source)

I heard that javassist automatically imported the java.lang package, but wouldn't that mean that java.lang.String would automatically be imported?

I then tried to insert the code using fully qualified class names such as:

java.io.BufferedReader reader = new java.io.BufferedReader (new java.io.FileReader(new java.io.File("file.txt")); java.lang.String a = reader.readline();

But that just changes from:

[source error] no such class: String

to:

[source error] no such class: java.lang.String

Here is my source code:

package RainbowBansTransAgent;  
import java.io.IOException; 
import java.lang.instrument.ClassFileTransformer; 
import java.lang.instrument.IllegalClassFormatException; 
import java.security.ProtectionDomain;  
import javassist.CannotCompileException; 
import javassist.CtClass; 
import javassist.CtField; 
import javassist.CtMethod; 
import javassist.CtNewMethod; 
import javassist.NotFoundException;  
public class Transformationer implements ClassFileTransformer {  

public byte[] transform(String arg1){ 
  try { 
  ClassLoader.getSystemClassLoader().loadClass("java.net.SocketAddress"); 
  this.getClass().getClassLoader().loadClass("java.net.SocketAddress"); 
  CtClass cc = TransAgent.coldwater.get(arg1); 
  if(cc.isFrozen()){ 
  BooleanKeys.frozen = true; 
  return null; 
 }else{ 
 cc.getClassFile().setMajorVersion(javassist.bytecode.ClassFile.JAVA_4);
 CtMethod m = cc.getDeclaredMethod("checkIfShouldDisconnect"); 
  String doublequote = String.valueOf('"'); 

  CtMethod method = CtNewMethod.make("public static java.lang.String getCauseOfBan(java.lang.String playername){" 
  + "java.lang.String cause = " + doublequote + "Server" + doublequote + ";" 
  + "try {" 
  +   "java.io.BufferedReader reader = new java.io.BufferedReader(new java.io.FileReader(new java.io.File(getRainbowPath()" +  doublequote + "banned-players.json" + doublequote + ")));" 
  +   "java.nio.file.Path path = java.nio.file.Paths.get(getRainbowPath(), " + doublequote + "banned-players.json" + doublequote + ");" 
  +   "byte[] filebytes = java.nio.file.Files.readAllBytes(path);" 
  +   "java.lang.String ln = new java.lang.String(filebytes);" 
  +   "java.lang.System.out.println(ln);"   
  + "int beginIndex = ln.indexOf(playername);" 
  +   "if(beginIndex < 0){" 
  +   "System.out.println(" + doublequote + "could not find" + doublequote + "playername" + ");" 
  +   "reader.close();" 
  +   "return " + doublequote + "Unknown" + doublequote + ";" 
  +   "}" 
  +   "java.lang.String plrln = ln.substring(beginIndex, ln.length());"
 +   "java.lang.String searchline = plrln.substring(0, plrln.indexOf(" + doublequote + "expires" + doublequote + "));" 
  +   "cause = plrln.substring((searchline.indexOf(" + doublequote + "source" + doublequote + ") + 10), (searchline.length() - 8));" 
  +   "reader.close();" 
  +"} catch (java.io.IOException e) {" 
  +   "e.printStackTrace();" 
  + "}" 
  + "return cause;" 
 + "}", cc);

 CtField f = CtField.make("java.io.File banmessage = new java.io.File(" + doublequote + "RainbowBans + File.separatorChar" + doublequote + " banmessage.txt);", cc); 
  CtField g = CtField.make("java.io.File adminplace = new java.io.File(" + doublequote + "banned-players.json" + doublequote + ");", cc); cc.addField(g); cc.addField(f); 
 cc.addMethod(method);

 int n = m.insertAt(409, true, "{ java.io.BufferedReader reader = null;" 
  + " reader = new java.io.BufferedReader(new java.io.FileReader(banmessage));" 
  + " java.lang.String message = reader.readLine();" 
  + " reader.close();" 
  + " java.lang.String admin = getCauseOfBan(var2.getName());" 
  + " java.lang.String var4 = message.replaceAll(" + doublequote + "%REASON%" + doublequote + ", var5.d()).replaceAll(" + doublequote + "%CURRENTTIME%" + doublequote + ", new java.util.Date().toString()).replaceAll(" + doublequote + "%ADMIN%" + doublequote + ", admin);}"); 

  if(n == 409){ 
  BooleanKeys.returns_line = true; 
  NumberKeys.line_Inserted_At = 409; 
  }else{ 
  BooleanKeys.returns_line = false; 
  NumberKeys.line_Inserted_At = n; 
  } 
  System.out.println("Code inserted at line " + n); 
  return cc.toBytecode();
 } 
  } catch (IOException e) { 
  BooleanKeys.error = true; 
  TransAgent.ln.add(69125L); 
  } catch (CannotCompileException e) {
 BooleanKeys.error = true; 
  TransAgent.ln.add(31513169125L); 
  TransAgent.randomexception = e; 
  } catch (ClassNotFoundException e) { 
  BooleanKeys.error = true; 
  TransAgent.ln.add(14152061521144L); 
  } catch (NotFoundException e) { 
  BooleanKeys.error = true; 
  TransAgent.ln.add(14152061521144L); 
  }
 return null; 
}  

@Override 
public byte[] transform(ClassLoader arg0, String className, Class<?> arg2, ProtectionDomain arg3, byte[] arg4) throws IllegalClassFormatException { 
  BooleanKeys.transformer_loaded = true; 
  byte[] b = null; 
  String realName = className.replaceAll("/", "."); 
  if(realName.equals("joebkt.PlayerList")){ 
  if(BooleanKeys.returned_bytes){ 
  return null; 
  }else{ 
  BooleanKeys.found_class = true; 
 b =  transform(realName); 
  if(b !=null){ 
  BooleanKeys.returned_bytes = true; 
  } 
  } 
  } else System.out.println("Class name " + realName + " is not what we're looking for!");
  return b; 
  }
}

EDIT: After some more research, I saw that quotes are usually defined as:

System.out.println(/"hello"/)

Do I need to do that?