How can I get the e.printStackTrace() and store it into a String variable?
I want to use the string generated by e.printStackTrace() later in my program.
I'm still new to Java so I'm not too familiar with StringWriter that I think
will be the solution. Or if you have any other ideas please let me know. Thanks
Something along the lines of
StringWriter errors = new StringWriter();
ex.printStackTrace(new PrintWriter(errors));
return errors.toString();
Ought to be what you need.
Relevant documentation:
PrintWriter after usage to release resources? Reading the docs I found that is not necessary for StringWriter.Guava makes this easy with Throwables.getStackTraceAsString(Throwable):
Exception e = ...
String stackTrace = Throwables.getStackTraceAsString(e);
Internally, this does what @Zach L suggests.
You can use the ExceptionUtils.getStackTrace(Throwable t); from Apache Commons 3 class org.apache.commons.lang3.exception.ExceptionUtils.
http://commons.apache.org/proper/commons-lang/
ExceptionUtils.getStackTrace(Throwable t)
Code example:
try {
// your code here
} catch(Exception e) {
String s = ExceptionUtils.getStackTrace(e);
}
You have to use getStackTrace () method instead of printStackTrace(). Here is a good example:
import java.io.*;
/**
* Simple utilities to return the stack trace of an
* exception as a String.
*/
public final class StackTraceUtil {
public static String getStackTrace(Throwable aThrowable) {
final Writer result = new StringWriter();
final PrintWriter printWriter = new PrintWriter(result);
aThrowable.printStackTrace(printWriter);
return result.toString();
}
/**
* Defines a custom format for the stack trace as String.
*/
public static String getCustomStackTrace(Throwable aThrowable) {
//add the class name and any message passed to constructor
final StringBuilder result = new StringBuilder( "BOO-BOO: " );
result.append(aThrowable.toString());
final String NEW_LINE = System.getProperty("line.separator");
result.append(NEW_LINE);
//add each element of the stack trace
for (StackTraceElement element : aThrowable.getStackTrace() ){
result.append( element );
result.append( NEW_LINE );
}
return result.toString();
}
/** Demonstrate output. */
public static void main (String... aArguments){
final Throwable throwable = new IllegalArgumentException("Blah");
System.out.println( getStackTrace(throwable) );
System.out.println( getCustomStackTrace(throwable) );
}
}
Along the lines of Guava, Apache Commons Lang has ExceptionUtils.getFullStackTrace in org.apache.commons.lang.exception. From a prior answer on StackOverflow.
StackTraceElement[] stack = new Exception().getStackTrace();
String theTrace = "";
for(StackTraceElement line : stack)
{
theTrace += line.toString();
}
Use the apache commons-lang3 lib
import org.apache.commons.lang3.exception.ExceptionUtils;
//...
String[] ss = ExceptionUtils.getRootCauseStackTrace(e);
logger.error(StringUtils.join(ss, System.lineSeparator()));
logger.error(StringUtils.join(ss, System.lineSeparator()));call: getStackTraceAsString(sqlEx)
public String getStackTraceAsString(Exception exc)
{
String stackTrace = "*** Error in getStackTraceAsString()";
ByteArrayOutputStream baos = new ByteArrayOutputStream();
PrintStream ps = new PrintStream( baos );
exc.printStackTrace(ps);
try {
stackTrace = baos.toString( "UTF8" ); // charsetName e.g. ISO-8859-1
}
catch( UnsupportedEncodingException ex )
{
Logger.getLogger(sss.class.getName()).log(Level.SEVERE, null, ex);
}
ps.close();
try {
baos.close();
}
catch( IOException ex )
{
Logger.getLogger(sss.class.getName()).log(Level.SEVERE, null, ex);
}
return stackTrace;
}
PrintWriter closes the ByteArrayOutputStream.
Throwable.getStackTrace()to a string. That could contain quite a bit less information than would be shown byThrowable.printStackTrace.