Getstacktrace to string java

How to convert a stack trace to a string?

Learn how to convert a stack trace to a String which includes all the Stack Trace message?

How to convert a stack trace to a string?

Example of converting StackTrace to String in Java Program

In this tutorial we are going to learn different ways to convert StackTrace to String in Java program. This conversion is required if you want to save the message in custom log file for further analysis of log message. The e.getMessage() in Java program only returns small portion of the error, but if you want to see the detailed error then StackTrace will give you complete detail about the error in the program.

Here we are going to discuss about few methods which can be used for the conversion of StackTrack error message into String. You can use any of the following methods:

• Core Java Libraries
• Google Guava Library
• Arrays class
• Apache commons stack trace to String

Conversion of StackTrace with Java API

Here one example of converting StackTrace to String in Java:

package net.roseindia; import java.io.PrintWriter; import java.io.StringWriter; public class ExceptionToString < public static void main(String[] args) < try < String strNum = "hello"; int i = Integer.parseInt(strNum); >catch (Exception e) < // e.printStackTrace(); System.out.println(stackTraceToString(e)); >> public static String stackTraceToString(Exception e) < StringWriter sw = new StringWriter(); PrintWriter pw = new PrintWriter(sw); e.printStackTrace(pw); String sStackTrace = sw.toString(); return sStackTrace; >>

If you run the above program it will convert StackTrace to String and print following converted error message:

java.lang.NumberFormatException: For input string: "hello" at java.lang.NumberFormatException.forInputString(Unknown Source) at java.lang.Integer.parseInt(Unknown Source) at java.lang.Integer.parseInt(Unknown Source) at net.roseindia.ExceptionToString.main(ExceptionToString.java:11)

In the above example code we have used StringWriter and PrintWriter classes to make a function which converts StrackTrace to String.

We have created following function for the conversation of StackTrace into String:

public static String stackTraceToString(Exception e)

This function can be used from another class for the conversion of error message into String.

Google Guava Library for conversion of StackTrace into String

The Google Guava is utility library in Java which provides many classes and methods which can be used in general programming. In this tutorial we are going to use the Throwables.getStackTraceAsString(e) method for converting StackTrace into String in our Java program.

Method signature: static String getStackTraceAsString(Throwable throwable)

This method takes the Throwable object as parameter and then returns a string which includes result of toString() and full, recursive stack trace of throwable object. So, it returns complete error details in String format.

package net.roseindia; import java.io.PrintWriter; import java.io.StringWriter; import com.google.common.base.Throwables; public class ExceptionToStringWithGoogleGuava < public static void main(String[] args) < try < String strNum = "hello"; int i = Integer.parseInt(strNum); >catch (Exception e) < // e.printStackTrace(); System.out.println(stackTraceToString(e)); //e.getMessage(); >> public static String stackTraceToString(Exception e) < String strStackTrace = Throwables.getStackTraceAsString(e); return strStackTrace; >>

You can easily add Google Guava maven library by adding following dependency code into pom.xml file of your project:

Apache maven is the easily method of managing dependency in Java projects. You can check more tutorials at Maven 3 Tutorials.

With Arrays Class

Following code can also be used:

After import Arrays class you can use following code for conversion:

Arrays.toString(e.getStackTrace());

But this code is returning all the error message in one line. For example if you can this code it will give you following output:

[java.lang.NumberFormatException.forInputString(Unknown Source), java.lang.Integer.parseInt(Unknown Source), java.lang.Integer.parseInt(Unknown Source), net.roseindia.ExceptionToStringWithGoogleGuava.main(ExceptionToStringWithGoogleGuava.java:14)]

As you can see all the output is in one line.

Apache commons stack trace to String

The Apache commons library can also be used to convert stack trace to String in Java. Here is an example of converting Stack Trace to String using Apache commons library:

package net.roseindia; import org.apache.commons.lang3.exception.ExceptionUtils; public class ExceptionToStringWithGoogleGuava < public static void main(String[] args) < try < String strNum = "hello"; int i = Integer.parseInt(strNum); >catch (Exception e) < // e.printStackTrace(); System.out.println(stackTraceToString(e)); >> public static String stackTraceToString(Exception e) < String strStacktrace = ExceptionUtils.getStackTrace(e); return strStacktrace; >>

In this section we have explored various ways to convert Exception Stack Trace into String.

Here are more tutorials related to Exception handling in Java:

• Printing a Stack Trace to the Server Console — Example codes for printing the Stack Trace on the Sever Console.
• How to Print a Stack Trace Message — Simple example of printing Stack Trace message from a Java program.
• Java get Stack Trace as String — Getting the complete Stack Trace message in the form of String in Java.
• Java Exceptions Tutorials With Examples — Many tutorials of exception handling in Java, learn how to handle exception in Java program.
• What are Chained Exceptions? — Detailed introduction of Chained Exceptions in Java programming language.
• Java :Thread dumpStack — How to get Thread dump in Java program.
• User Defined Exception In Java — How to create user defined exception in Java programming language.
• Java Exception Class Hierarchy Diagram — Learn the Exception hierarchy in Java with the help of diagram.
• Java Conversion Examples — Converting Java objects into another in Java programming language. Learn data type conversion in Java with 100s of examples.

We have 1000’s of Java programming tutorial on our website and all you can browser from the Java Tutorials index page. Our tutorials are organized into sections for easy navigation.

Tutorials

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34. Convert Double To String
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Convert Exception StackTrace to String in Java

Learn to convert Java exception stack trace to a String. From StackTrace to String conversion may be useful when we want to print stack traces in log files or store logs in a database for audit purposes.

Note that Java does not have an inbuilt direct API to get the stack trace as String.

1. Using StringWriter and PrintWriter

By default, Throwable.printStackTrace() prints the exception backtrace to the standard error stream that is the value of the field System.err. By default, the System.err prints to the console.

We can use the overloaded method printStackTrace(writer) to print the backtrace to the specified print Writer such as a PrintWriter. This PrintWriter is targeted towards a StringWriter.

To convert a stack trace using StringWriter, follow these steps

• Print throwable stack trace and its backtrace to the PrintWriter.
• Copy print writer content to StringWriter.
• Use StringWriter.toString() to get the stack trace as string.

We are using try-with-resource to create StringWriter and PrintWriter instances that automatically close both writers when processing is complete.

In the following program, we create a NullPointerException and print its stack trace after converting it to String.

NullPointerException npe = new NullPointerException("Custom error"); String errorStr = null; try (StringWriter sw = new StringWriter(); PrintWriter pw = new PrintWriter(sw)) < npe.printStackTrace(pw); errorStr = sw.toString(); >catch (IOException e) < throw new RuntimeException("Error while converting the stacktrace"); >System.out.println(errorStr);

java.lang.NullPointerException: Custom error at com.howtodoinjava.demo.StackTrace.main(StackTrace.java:11)

Apache common langs3 library has one excellent utility class ExceptionUtils. Its getStackTrace() method returns a string representation of any Java exception.

 org.apache.commons commons-lang3 3.12.0 

The following Java program copies the stack trace to a string.

String errorStr = ExceptionUtils.getStackTrace(new NullPointerException("Custom error")); System.out.println(errorStr);

java.lang.NullPointerException: Custom error at com.howtodoinjava.demo.StringExample.main(StringExample.java:11)

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Конвертация Stack Trace в строку в Java

В работе с Java часто возникает необходимость преобразования Stack Trace в строку. Это может быть полезно, например, при логировании исключений.

Допустим, у нас есть следующий код:

Вызов метода printStackTrace() напишет stack trace в стандартный поток ошибок. Однако, что если мы хотим записать этот stack trace в строку, чтобы использовать его где-то еще?

Методы преобразования Stack Trace в строку

Существуют несколько способов преобразовать Stack Trace в строку в Java.

С использованием StringWriter и PrintWriter

Один из способов — использовать классы StringWriter и PrintWriter из стандартной библиотеки Java. Вот как это делается:

StringWriter sw = new StringWriter(); PrintWriter pw = new PrintWriter(sw); e.printStackTrace(pw); String stackTrace = sw.toString();

В этом коде StringWriter создает буфер, в который можно записывать символы. PrintWriter принимает StringWriter в качестве аргумента и направляет вывод в этот StringWriter . Затем printStackTrace(PrintWriter s) пишет stack trace в PrintWriter , который в свою очередь записывает его в StringWriter . Содержимое StringWriter затем можно получить в виде строки.

С использованием Apache Commons Lang

Если в проекте используется библиотека Apache Commons Lang, то можно использовать утилиту ExceptionUtils для преобразования Stack Trace в строку:

String stackTrace = ExceptionUtils.getStackTrace(e);

Здесь getStackTrace(Throwable throwable) — это статический метод, который возвращает полный stack trace для переданного исключения.

Заключение

Как видно, преобразование Stack Trace в строку в Java — это простая задача, которую можно выполнить несколькими способами. Выбор метода зависит от требований проекта и доступных библиотек.

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Convert Stack Trace to String in Java

Handling exceptions in Java require an exception to storing in a file or might need it for some additional analysis than simply logging it. In this post, we will cover how to convert stack trace to string in Java.

1 Using Core Java API

Core Java API provides easy and efficient way to convert stack trace to string using StringWriter and PrintWriter

 StringWriter writer = new StringWriter(); PrintWriter printWriter= new PrintWriter(writer); exception.printStackTrace(printWriter);

 public class StackTraceToStringJava < public static void main(String[] args) < try < throwDummyException(); >catch (FileNotFoundException exception) < StringWriter writer = new StringWriter(); PrintWriter printWriter= new PrintWriter(writer); exception.printStackTrace(printWriter); System.out.println("Exception in String is :: " + writer.toString()); >> public static void throwDummyException() throws FileNotFoundException < throw new FileNotFoundException("Throwing file not found exception for demo purpose"); >> 

 Exception in String is :: java.io.FileNotFoundException: Throwing file not found exception for demo purpose at com.umeshawasthi.tutorials.corejava.exception.StackTraceToStringJava.throwDummyException(StackTraceToStringJava.java:26) at com.umeshawasthi.tutorials.corejava.exception.StackTraceToStringJava.main(StackTraceToStringJava.java:15) 

Calling writer.toString() will provide stack trace in String format.

2 Using Apache Commons Lang API

Apache Commons Lang API ExceptionUtils class can be used to convert stack trace to String with a simple one line.

 public class StackTraceToStringApache < public static void main(String[] args) < try < throwDummyException(); >catch (FileNotFoundException exception) < String stackTraceAsString= ExceptionUtils.getStackTrace(exception); System.out.println("Strack Trace using Apache Commons :" + stackTraceAsString); >> public static void throwDummyException() throws FileNotFoundException < throw new FileNotFoundException("Throwing file not found exception for demo purpose Apache Commons Lang"); >> 

 Strack Trace using Apache Commons :java.io.FileNotFoundException: Throwing file not found exception for demo purpose Apache Commons Lang at com.umeshawasthi.tutorials.corejava.exception.StackTraceToStringApache.throwDummyException(StackTraceToStringApache.java:23) at com.umeshawasthi.tutorials.corejava.exception.StackTraceToStringApache.main(StackTraceToStringApache.java:15) 

To Apache Commons Lang API, we need to add it to classpath, We will use Maven for this (Simply add to lib folder if not using Maven)

 org.apache.commons commons-lang3 3.5  

3 Using Guava’s Throwable Class

Google Guava class provide Throwable utility class to convert stack trace to String

 String stackTrace = Throwables.getStackTraceAsString ( exception ) ;

We saw there are a number of different ways to Convert stack trace to String in Java using Java core API and third party API available.

Java 9 will be introducing StackWalker API which will provide more easy and efficient way to perform these operations.

All the code of this article is available Over on Github. This is a Maven-based project.

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