Viewing contents of a jar file

Question

What would be the easiest way to view classes  methods  properties  etc  inside a jar file  I m looking for something equivalent to the very useful  Lutz Roeder  NET Reflector  - for Java

User · Answer

I usually open them with 7-Zip    It allows at least to see packages and classes and resources  Should I need to see methods or fields  I would use Jad but of course  it is better to rely on  good  JavaDoc     Now  somewhere on SO was mentioned some Eclipse plug-ins  to find in which jar file a class is located  perhaps they can do more  ie  what you requested     EDIT  Reference to SO thread  Not what is asked  but somehow related  thus useful  Java  How do I know which jar file to use given a class name

User · Answer

Use WinRar  It will open the folder structure for you in intact manner  Also allows in-archive editing  while preserving paths   Afterall  a JAR file is a ZIP archive only

User · Answer

You could try JarSpy   There is an IDEA plugin version of it that I use

User · Answer

My requirement was to view the content of a file  like a property file  inside the jar  without actually extracting the jar  If anyone reached this thread just like me  try this command -  unzip -p myjar jar myfile txt   This worked well for me

User · Answer

I ve set the default action in windows to  Open with WinZip    This makes it easy to manage JARs as archives   You can even add remove files manually

User · Answer

I prefer JAR Browser  it has a simple interface where you can browse multiple JARs  and search for a specific class across multiple JARs simultaneously

User · Answer

I prefer JAR Browser  it has a simple interface where you can browse multiple JARs  and search for a specific class across multiple JARs simultaneously

User · Answer

Eclipse 3 4 JDT  It is not the quickest way because you have to drag it into your eclipse first  But you will have full java class browsing  even with decompile enabled

User · Answer

Using the JDK  jar -tf will list the files in the jar  javap will give you more details from a particular class file

User · Answer

What I use personally is JD-GUI  It is a free  decompiler   as it allows you to see the source code  classes  and objects in the classes  as well as see the file structure in a tree menu to the left  However  it does not allow  you to modify the classes directly   JD-GUI s website  http   jd benow ca

User · Answer

Method names  fields  etc  By adding a jar to a project in an IDE  you can usually see methods and field names  but not the detailed implementation  NetBeans can do it  Eclipse probably  IntelliJ probably  etc  You can browse the jar structure directly within the IDE  Just the contents For anything such as viewing the contents  you could use    jar tvf jarfile jar winzip or any zip tool  The source code To access source code  you would use a decompiler such as JAD or one of its frontends or another decompiler  If the code is obfuscated  then

User · Answer

Your IDE should also support this  My IDE  SlickeEdit  calls it a  tag library   Simply add a tag library for the jar file  and you should be able to browse the classes and methods in a hierarchical manner

User · Answer

I usually open them with 7-Zip    It allows at least to see packages and classes and resources  Should I need to see methods or fields  I would use Jad but of course  it is better to rely on  good  JavaDoc     Now  somewhere on SO was mentioned some Eclipse plug-ins  to find in which jar file a class is located  perhaps they can do more  ie  what you requested     EDIT  Reference to SO thread  Not what is asked  but somehow related  thus useful  Java  How do I know which jar file to use given a class name

User · Answer

Jad is klunky and no longer maintained  I ve switched to  Java Decompiler   which has a slick UI and support for new language features    Every decompiler I ve used  though  runs into code it doesn t successfully decompile  For those  it helps to understand the disassembled Java byte code produced by the standard JDK tool  javap

User · Answer

You could try JarSpy   There is an IDEA plugin version of it that I use

User · Answer

You could try JarNavigator to view and search contents of a jar file

User · Answer

In case someone don t know this already  a JAR file is just a ZIP file   that contains the program s classes  resources  etc   and some   metadata  You can extract one to see how it s put together    Hence I am using unzip command which is easy to remember and use   unzip -l  lt jar-file-name gt  jar   For example  if you have a jar file with name test jar then unzip -l test jar will list all the content of jar file   While all other answers are great  but in most of them  you would have to use some software like 7 zip or JDK or some other eclipse tool while this doesn t require you to have any of these big s w and it comes by default in linux and mac so its very lightweight and handy to use    You can also use zipinfo  lt your jar file gt   if your OS supports this

User · Answer

Well  a jar-file is just a zip-file  so if you unzip it  with your favorite unzipping utility   you get all the files inside    If you want to look inside the class files to see the methods  you ll need a tool for that  As PhiLho mentions  Eclipse is able to do that  by default   and I would think most Java IDEs are capable of that

User · Answer

If I understand correctly  you want to see not only classes but also methods  properties and so on  The only tool I know that can do it is Eclipse - if you add a jar to project classpath  you would be able to browse its classes with methods and properties using usual package explorer   Anyway  this is a good idea for a good standalone Java tool

User · Answer

Eclipse 3 4 JDT  It is not the quickest way because you have to drag it into your eclipse first  But you will have full java class browsing  even with decompile enabled

User · Answer

Bndtools provides a free JAR viewer plugin for Eclipse   Add the Eclipse update site and install only the viewer

User · Answer

Use WinRar  It will open the folder structure for you in intact manner  Also allows in-archive editing  while preserving paths   Afterall  a JAR file is a ZIP archive only

User · Answer

Jad is klunky and no longer maintained  I ve switched to  Java Decompiler   which has a slick UI and support for new language features    Every decompiler I ve used  though  runs into code it doesn t successfully decompile  For those  it helps to understand the disassembled Java byte code produced by the standard JDK tool  javap

User · Answer

In case someone don t know this already  a JAR file is just a ZIP file   that contains the program s classes  resources  etc   and some   metadata  You can extract one to see how it s put together    Hence I am using unzip command which is easy to remember and use   unzip -l  lt jar-file-name gt  jar   For example  if you have a jar file with name test jar then unzip -l test jar will list all the content of jar file   While all other answers are great  but in most of them  you would have to use some software like 7 zip or JDK or some other eclipse tool while this doesn t require you to have any of these big s w and it comes by default in linux and mac so its very lightweight and handy to use    You can also use zipinfo  lt your jar file gt   if your OS supports this

User · Answer

I use JarExplorer or JarVisualizer

User · Answer

Also you can use Luyten - An Open Source Java Decompiler Gui

User · Answer

java -xf some-j jar will unzip a JAR file

User · Answer

Extending Tom Hawtin answer  you can pipe the listing to filter out desired class or files   jar tf my-fat-jar-file jar   grep filename  This should work on bash zsh and similars  or emacs  eshell   Additional information  https   docs oracle com javase tutorial deployment jar view html

User · Answer

What I use personally is JD-GUI  It is a free  decompiler   as it allows you to see the source code  classes  and objects in the classes  as well as see the file structure in a tree menu to the left  However  it does not allow  you to modify the classes directly   JD-GUI s website  http   jd benow ca

User · Answer

jar -tvf file name jar   above will only print names of the files    To view the content of files  you can extract the files in a folder by   jar -xvf file name jar   this will unzip jar file  amp  put the content in same directory where you are running this   Or in Windows rename  jar file to  zip  amp  then you can unzip to extract  amp  view the content of jar file  As jar is internally a zip file

User · Answer

I think Java Decomplier is your best option you can download from here  http   jd benow ca

User · Answer

Your IDE should also support this  My IDE  SlickeEdit  calls it a  tag library   Simply add a tag library for the jar file  and you should be able to browse the classes and methods in a hierarchical manner

User · Answer

On Mac there s Jarzilla

User · Answer

I prefer JAR Browser  it has a simple interface where you can browse multiple JARs  and search for a specific class across multiple JARs simultaneously

User · Answer

Bndtools provides a free JAR viewer plugin for Eclipse   Add the Eclipse update site and install only the viewer

User · Answer

My requirement was to view the content of a file  like a property file  inside the jar  without actually extracting the jar  If anyone reached this thread just like me  try this command -  unzip -p myjar jar myfile txt   This worked well for me

User · Answer

jar -tvf file name jar   above will only print names of the files    To view the content of files  you can extract the files in a folder by   jar -xvf file name jar   this will unzip jar file  amp  put the content in same directory where you are running this   Or in Windows rename  jar file to  zip  amp  then you can unzip to extract  amp  view the content of jar file  As jar is internally a zip file

User · Answer

Jad is klunky and no longer maintained  I ve switched to  Java Decompiler   which has a slick UI and support for new language features    Every decompiler I ve used  though  runs into code it doesn t successfully decompile  For those  it helps to understand the disassembled Java byte code produced by the standard JDK tool  javap

User · Answer

You can open them with most decompression utilities these days  then just get something like DJ Java Decompiler if you want to view the source

User · Answer

Well  a jar-file is just a zip-file  so if you unzip it  with your favorite unzipping utility   you get all the files inside    If you want to look inside the class files to see the methods  you ll need a tool for that  As PhiLho mentions  Eclipse is able to do that  by default   and I would think most Java IDEs are capable of that

User · Answer

You could try JarSpy   There is an IDEA plugin version of it that I use

User · Answer

I ve set the default action in windows to  Open with WinZip    This makes it easy to manage JARs as archives   You can even add remove files manually

User · Answer

If you are in windows and using powershell and you are looking for a file in a jar you can do   jar -tf    JAR NAME    where     -match   FILENAME

User · Answer

One way to do this is to open the perspective in  Package explorer   Doing this you can see the structure of your jar with class details  For this check the library folder in your project using package explorer   Window  Show View  Other  Java  Package Explorer   Another way  is  you can use JarPlug as a eclipse plugin  This works in eclipse springsource  http   jar-plug sourceforge net

User · Answer

If you like to see whats inside  simply rename as first option below     F2  amp  Rename to jarfile zip      Use any unzipper    jar tvf jarfile jar     jar tf jarfile jar

User · Answer

Using the JDK  jar -tf will list the files in the jar  javap will give you more details from a particular class file

User · Answer

In Eclipse 3 4 do   Drag the jar file in question into a Java project   A copy of the jar file appears  Right click on the jar file  and choose  Build Path  -   Add to Build Path     Jar file is moved to  Referenced Libraries  node  where it can be opened and navigated in the Project Explorer pane     If seeing source code too is an issue  open a new question   For navigation on Jar-file level  as a zip file  I use 7zip which works very well  and allows seeing and editing entries which is great for trouble shooting

User · Answer

You could try JarSpy   There is an IDEA plugin version of it that I use

User · Answer

If you like to see whats inside  simply rename as first option below     F2  amp  Rename to jarfile zip      Use any unzipper    jar tvf jarfile jar     jar tf jarfile jar

User · Answer

You can view JAR files like ZIP files from Windows Explorer by doing the following    Run Command Prompt as Administrator From the command line  enter   assoc  jar CompressedFolder While you are at it  you might as well do the same for WAR and EAR files   assoc  war CompressedFolder  assoc  ear CompressedFolder

User · Answer

I usually open them with 7-Zip    It allows at least to see packages and classes and resources  Should I need to see methods or fields  I would use Jad but of course  it is better to rely on  good  JavaDoc     Now  somewhere on SO was mentioned some Eclipse plug-ins  to find in which jar file a class is located  perhaps they can do more  ie  what you requested     EDIT  Reference to SO thread  Not what is asked  but somehow related  thus useful  Java  How do I know which jar file to use given a class name

User · Answer

On Mac there s Jarzilla

User · Answer

One way to do this is to open the perspective in  Package explorer   Doing this you can see the structure of your jar with class details  For this check the library folder in your project using package explorer   Window  Show View  Other  Java  Package Explorer   Another way  is  you can use JarPlug as a eclipse plugin  This works in eclipse springsource  http   jar-plug sourceforge net

User · Answer

You can view JAR files like ZIP files from Windows Explorer by doing the following    Run Command Prompt as Administrator From the command line  enter   assoc  jar CompressedFolder While you are at it  you might as well do the same for WAR and EAR files   assoc  war CompressedFolder  assoc  ear CompressedFolder

User · Answer

I prefer JAR Browser  it has a simple interface where you can browse multiple JARs  and search for a specific class across multiple JARs simultaneously

User · Answer

Use WinRar  It will open the folder structure for you in intact manner  Also allows in-archive editing  while preserving paths   Afterall  a JAR file is a ZIP archive only

User · Answer

I usually open them with 7-Zip    It allows at least to see packages and classes and resources  Should I need to see methods or fields  I would use Jad but of course  it is better to rely on  good  JavaDoc     Now  somewhere on SO was mentioned some Eclipse plug-ins  to find in which jar file a class is located  perhaps they can do more  ie  what you requested     EDIT  Reference to SO thread  Not what is asked  but somehow related  thus useful  Java  How do I know which jar file to use given a class name

User · Answer

I think Java Decomplier is your best option you can download from here  http   jd benow ca

User · Answer

java -xf some-j jar will unzip a JAR file

User · Answer

I ve set the default action in windows to  Open with WinZip    This makes it easy to manage JARs as archives   You can even add remove files manually

User · Answer

Extending Tom Hawtin answer  you can pipe the listing to filter out desired class or files   jar tf my-fat-jar-file jar   grep filename  This should work on bash zsh and similars  or emacs  eshell   Additional information  https   docs oracle com javase tutorial deployment jar view html

User · Answer

You can open them with most decompression utilities these days  then just get something like DJ Java Decompiler if you want to view the source

User · Answer

Well  a jar-file is just a zip-file  so if you unzip it  with your favorite unzipping utility   you get all the files inside    If you want to look inside the class files to see the methods  you ll need a tool for that  As PhiLho mentions  Eclipse is able to do that  by default   and I would think most Java IDEs are capable of that

User · Answer

If I understand correctly  you want to see not only classes but also methods  properties and so on  The only tool I know that can do it is Eclipse - if you add a jar to project classpath  you would be able to browse its classes with methods and properties using usual package explorer   Anyway  this is a good idea for a good standalone Java tool

User · Answer

You can open them with most decompression utilities these days  then just get something like DJ Java Decompiler if you want to view the source

User · Answer

Well  a jar-file is just a zip-file  so if you unzip it  with your favorite unzipping utility   you get all the files inside    If you want to look inside the class files to see the methods  you ll need a tool for that  As PhiLho mentions  Eclipse is able to do that  by default   and I would think most Java IDEs are capable of that

User · Answer

Jad is klunky and no longer maintained  I ve switched to  Java Decompiler   which has a slick UI and support for new language features    Every decompiler I ve used  though  runs into code it doesn t successfully decompile  For those  it helps to understand the disassembled Java byte code produced by the standard JDK tool  javap

User · Answer

If I understand correctly  you want to see not only classes but also methods  properties and so on  The only tool I know that can do it is Eclipse - if you add a jar to project classpath  you would be able to browse its classes with methods and properties using usual package explorer   Anyway  this is a good idea for a good standalone Java tool

User · Answer

You could try JarNavigator to view and search contents of a jar file

User · Answer

Use WinRar  It will open the folder structure for you in intact manner  Also allows in-archive editing  while preserving paths   Afterall  a JAR file is a ZIP archive only

User · Answer

This Jar Explorer is good enough   Supports three decompiler types  JD  Procyon and Fernflower  Allows to search files and duplicates in any java archive  Also user can modify jar by D amp D files and edit some non-class files

User · Answer

You can open them with most decompression utilities these days  then just get something like DJ Java Decompiler if you want to view the source

User · Answer

Eclipse 3 4 JDT  It is not the quickest way because you have to drag it into your eclipse first  But you will have full java class browsing  even with decompile enabled

User · Answer

Eclipse 3 4 JDT  It is not the quickest way because you have to drag it into your eclipse first  But you will have full java class browsing  even with decompile enabled

User · Answer

Using the JDK  jar -tf will list the files in the jar  javap will give you more details from a particular class file

User · Answer

I use JarExplorer or JarVisualizer

User · Answer

If I understand correctly  you want to see not only classes but also methods  properties and so on  The only tool I know that can do it is Eclipse - if you add a jar to project classpath  you would be able to browse its classes with methods and properties using usual package explorer   Anyway  this is a good idea for a good standalone Java tool

User · Answer

Also you can use Luyten - An Open Source Java Decompiler Gui

User · Answer

Using the JDK  jar -tf will list the files in the jar  javap will give you more details from a particular class file

User · Answer

Your IDE should also support this  My IDE  SlickeEdit  calls it a  tag library   Simply add a tag library for the jar file  and you should be able to browse the classes and methods in a hierarchical manner

User · Answer

This Jar Explorer is good enough   Supports three decompiler types  JD  Procyon and Fernflower  Allows to search files and duplicates in any java archive  Also user can modify jar by D amp D files and edit some non-class files

User · Answer

In Eclipse 3 4 do   Drag the jar file in question into a Java project   A copy of the jar file appears  Right click on the jar file  and choose  Build Path  -   Add to Build Path     Jar file is moved to  Referenced Libraries  node  where it can be opened and navigated in the Project Explorer pane     If seeing source code too is an issue  open a new question   For navigation on Jar-file level  as a zip file  I use 7zip which works very well  and allows seeing and editing entries which is great for trouble shooting

User · Answer

If you are in windows and using powershell and you are looking for a file in a jar you can do   jar -tf    JAR NAME    where     -match   FILENAME

User · Answer

Your IDE should also support this  My IDE  SlickeEdit  calls it a  tag library   Simply add a tag library for the jar file  and you should be able to browse the classes and methods in a hierarchical manner

User · Answer

Method names  fields  etc  By adding a jar to a project in an IDE  you can usually see methods and field names  but not the detailed implementation  NetBeans can do it  Eclipse probably  IntelliJ probably  etc  You can browse the jar structure directly within the IDE  Just the contents For anything such as viewing the contents  you could use    jar tvf jarfile jar winzip or any zip tool  The source code To access source code  you would use a decompiler such as JAD or one of its frontends or another decompiler  If the code is obfuscated  then

User · Answer

I ve set the default action in windows to  Open with WinZip    This makes it easy to manage JARs as archives   You can even add remove files manually

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