Thread: Set error to string buffer

StringBuffer sb = new StringBuffer();
ExecutorService executor = Executors.newFixedThreadPool (10);
for (String p:pCall) { Runnable runner -> {
fProc="{call "+p+")"; csProcCall = con.prepareCall (fProc); csProcCall.registerOut Parameter (1,OracleTypes.VARCHAR) ;
csProcCall.executeQuery (); String errorMsg = (String) csProcCall.getObject(1);
Common.log(errorMsg);
if (!errorMsg.equals IgnoreCase ("SUCCESS")) { errorMessage=errorMessage+errorMsg;
}
System.out.println("parallel procedure execution" + p);
executor.execute (runner) ;
sb.append("Started the procedure" + p);
}
executor.shutdown();
while (!executor.isTerminated()) {
}

Please help me out to convert the if statement block to string buffer to run the code successfully

At First it was for loop now i have converted the part of code to multi threading so it doesn't support simple if statement for error statement so i have to set the error to string buffer. Please help me with that

String proc=DBCRConstants.getDbcr Proc();
String fProc=null;
String [] pCall-new String[7];
String errorMessage=""; 
pCall-proc.split(", ");
StringBuffer sb = new StringBuffer();
ExecutorService executor =
      Executors.newFixedThreadPool (10);
for (String p:pCall) {
 Runnable runner -> {
fProc="{call "+p+")"; 
csProcCall = con.prepareCall (fProc); csProcCall.registerOut Parameter (1,OracleTypes.VARCHAR) ;
csProcCall.executeQuery (); 
String errorMsg = (String) csProcCall.getObject(1);
Common.log(errorMsg);
if (!errorMsg.equals IgnoreCase ("SUCCESS")) 
{ 
errorMessage=errorMessage+errorMsg;
}
System.out.println("parallel procedure execution" + p);
executor.execute (runner) ;
sb.append("Started the procedure" + p);
}
executor.shutdown();
while (!executor.isTerminated()) {
}