Java How to add library files in netbeans

Question

I am new to the Netbeans IDE and Java   I have a java project that shows lot of compilation errors    can not import  org apache commons logging Log    Can somebody please help me with these errors  How do I add library files in Netbeans IDE

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For Netbeans 2020 September version  JDK 11  Suggesting this for Gradle project only  1  create libs folder in src main java folder of the project 2  copy past  all library jars in there 3   open build gradle in files tab of project window in project s root 4  correct main class  mine is mainClassName    uz ManipulatorIkrom   5  and in dependencies add next  string  apply plugin   java   apply plugin   jacoco   apply plugin   application  description    testing netbeans  mainClassName    uz ManipulatorIkrom    4th step repositories       jcenter     dependencies       implementation fileTree dir   src main java libs   include     jar     5th step       6  save  clean-build and  then run the app

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In Netbeans 8 2  1  Dowload the binaries from the web source  The Apache Commos are in   http   commons apache org components html  1  In this case  you must select the  Logging  in the Components menu and follow the link to downloads in the Releases part  Direct URL   http   commons apache org proper commons-logging download logging cgi  2  For me  the correct download was the file  commons-logging-1 2-bin zip from the Binaries   2  Unzip downloaded content  Now  you can see several jar files inside the directory created from the zip file   3  Add the library to the project  Right click in the project  select Properties and click in Libraries  in the left side   Click the button  Add Jar Folder   Go to the previously unzipped contents and select the properly jar file  Clic in  Open  and click in Ok   The library has been loaded

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How to import a commons-library into netbeans    Evaluate the error message in NetBeans   java lang NoClassDefFoundError  org apache commons logging LogFactory  NoClassDeffFoundError means somewhere under the hood in the code you used  a method called another method which invoked a class that cannot be found   So what that means is your code did this   MyFoobarClass foobar   new MyFoobarClass   and the compiler is confused because nowhere is defined this MyFoobarClass   This is why you get an error  To know what to do next  you have to look at the error message closely   The words  org apache commons  lets you know that this is the codebase that provides the tools you need   You have a choice  either you can import EVERYTHING in apache commons  or you could import JUST the LogFactory class  or you could do something in between   Like for example just get the logging bit of apache commons  You ll want to go the middle of the road and get commons-logging   Excellent choice  fire up the google and search for apache commons-logging   The first link takes you to http   commons apache org proper commons-logging    Go to downloads   There you will find the most up-to-date ones   If your project was compiled under ancient versions of commons-logging  then use those same ancient ones because if you use the newer ones  the code may fail because the newer versions are different  You re going to want to download the commons-logging-1 1 3-bin zip or something to that effect   Read what the name is saying   The  zip means it s a compressed file   commons-logging means that this one should contain the LogFactory class you desire   the middle 1 1 3 means that is the version   if you are compiling for an old version  you ll need to match these up  or else you risk the code not compiling right due to changes due to upgrading  Download that zip   Unzip it   Search around for things that end in  jar   In netbeans right click your project  click properties  click libraries  click  add jar folder  and import those jars   Save the project  and re-run  and the errors should be gone    The binaries don t include the source code  so you won t be able to drill down and see what is happening when you debug   As programmers you should be downloading  the source  of apache commons and compiling from source  generating the jars yourself and importing those for experience   You should be smart enough to understand and correct the source code you are importing   These ancient versions of apache commons might have been compiled under an older version of Java  so if you go too far back  they may not even compile unless you compile them under an ancient version of java

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Quick solution in NetBeans 6 8   In the Projects window right-click on the name of the project that lacks library -  Properties -  The Project Properties window opens  In Categories tree select  Libraries  node -  On the right side of the Project Properties window press button  Add JAR Folder  -  Select jars you need   You also can see my short Video How-To

[java] Java, How to add library files in netbeans?

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