Importing gson library - working for new sketches, but not for existing ones

personaln..

Importing gson library - working for new sketches, but not for existing ones

in Contributed Library Questions • 9 months ago

I'm trying to use the com.google.gson library in my sketch. I've followed the usual instructions to install Java libraries and it works fine, unless I try to use it in a specific project!

To be clear, if I create a new sketch and click Import Library, gson shows up. If I select gson, the import statements appear, I can instance gson objects fine, everything seems okay.

The problem comes when I try to open an existing project and import gson. In that case I get the familiar error:

"Libraries must be installed in a folder named 'libraries' inside the 'sketchbook' folder.
ExportImport.java:1:0:1:0: The package âcom.googleâ does not exist. You might be missing a library."

Does anyone know what might cause this difference between new sketches and an existing project? I'm at a loss!

My Sketchbook file structure is as follows:

.

├── Tutorials

│ ├── Camera.java

│ ├── ExportImport.java

│ ├── FileChooser.java

│ ├── GUI.java

│ ├── Geometry.java

│ ├── Image.java

│ ├── KeyboardControls.java

│ ├── ModifiableVector.java

│ ├── Shape.java

│ ├── ShapeManager.java

│ ├── Tutorials.pde

│ ├── ZoomControl.java

│ ├── build-tmp

│ │ ├── Camera.class

│ │ ├── FileChooser.class

│ │ ├── GUI.class

│ │ ├── Geometry.class

│ │ ├── Image.class

│ │ ├── KeyboardControls.class

│ │ ├── ModifiableVector.class

│ │ ├── Shape.class

│ │ ├── ShapeManager.class

│ │ ├── Tutorials.class

│ │ ├── ZoomControl.class

│ │ └── source

│ │ ├── Camera.java

│ │ ├── ExportImport.java

│ │ ├── FileChooser.java

│ │ ├── GUI.java

│ │ ├── Geometry.java

│ │ ├── Image.java

│ │ ├── KeyboardControls.java

│ │ ├── ModifiableVector.java

│ │ ├── Shape.java

│ │ ├── ShapeManager.java

│ │ ├── Tutorials.java

│ │ └── ZoomControl.java

│ └── data

│ ├── folder.png

│ ├── polygon.png

│ ├── save.png

│ ├── zoomin.png

│ └── zoomout.png

├── libraries

│ └── gson

│ └── library

│ └── gson.jar

├── modes

└── tools

Anything seem specifically wrong? I've tried cleaning out the build-tmp folder, running the sketch from within processing and through processing-java.

Replies(3)

Chrisir

Re: Importing gson library - working for new sketches, but not for existing ones

9 months ago

try this:

when you have your pde-file in the processing IDE drag the gson.jar file on the editor

personaln..

Re: Importing gson library - working for new sketches, but not for existing ones

9 months ago

That worked! Thank you!

So dragging the jar onto the Processing IDE created a code directory inside the sketch folder with the jar inside it. Should that be added to the wiki?

PhiLho

Re: Importing gson library - working for new sketches, but not for existing ones

9 months ago

The solution given by Chrisir has an inconvenience: you have a jar file per sketch, which can be annoying.

I don't understand why you get such error. But at worst, you can copy & paste the import statements from your working sketches.

Top Reply