I have some ast parser code in eclipse but I am unable to import the
import org.eclipse.jdt.core.dom.AST;
import org.eclipse.jdt.core.dom.ASTParser;
packages.
could some body tell me which jar file to download and where to add same that jar file in eclipse folder.
You probably have those files downloaded already in eclipse\plugins folder i.e. in windows C:\Program Files\eclipse\plugins\org.eclipse.jdt.core_3.9.1.v20130905-0837.jar
Of course you can download from internet as well
http://central.maven.org/maven2/org/eclipse/tycho/org.eclipse.jdt.core/
Note that in order to run it as a stand alone application you will have to import such librariers (where xx stands for version and again they can be found in eclipse\plugins folder):
org.eclipse.core.contenttype_xx.jar
org.eclipse.core.jobs_xx.jar
org.eclipse.core.resources_xx.jar
org.eclipse.core.runtime_xx.jar
org.eclipse.equinox.common_xx.jar
org.eclipse.equinox.preferences_xx.jar
org.eclipse.jdt.core_xx.jar
org.eclipse.osgi_xx.jar
Usually people add other libraries in folder called lib but still you will have to set it in eclipse. In order to do that right click on your project then build path -> configure build path -> libraries and select add JAR.
Related
I use PyCharm and Eclipse with PyDev.
To be specific, I am using Odoo and setting up project.
https://github.com/odoo/odoo
Here is the folder structure.
odoo-12
|-addons
| '-web
| '-...
|-odoo
'-addons
'-...
In source code for example:
addons/purchase/controllers/portal.py
# Unresolved yet this is the official source code
from odoo.addons.web.controllers.main import Binary
# Resolved perfectly
from addons.web.controllers.main import Binary
I understand the reason why this one works
from addons.web.controllers.main import Binary
but how can I make this works instead?
from odoo.addons.web.controllers.main import Binary
I cannot and should not modify any Odoo source code to make IDE resolving path correctly
In Eclipse/PyDev you should be able to set your source folder to the folder containing odoo and it should work...
I have two Android workspaces, and I would like to use the same class for both. I want to import instead of just copy and paste the class (just to learn how to import .jar and/or the classpath folder).
Creating my .jar
On my first Android application:
right click on my project folder --> Export... --> Java --> JAR File --> Next
Then this is what would come up:
Then I click finish.
There are 20+ classes in that app, but one of them is CopyPaste.java located like so in my project:
Calculator\src\com.mikeyaworski.calculator\CopyPaste.java
Adding .jar to build path (other workspace)
right click on project folder --> Build Path --> Configure Build Path... --> Libraries --> Add External JARs... and then I choose it.
It'll look like this afterward:
Using a class from the .jar
I add this import statement:
import com.mikeyaworski.calculator.CopyPaste;
But it gives me the error:
The import com.mikeyaworski.calculator.CopyPaste cannot be resolved
Then I would just try to create an instance of the class like this:
CopyPaste c = new CopyPaste(getApplicationContext());
Questions
How can I get rid of that error?
If I add an External Class Folder to the build path instead, how can I use that to use a class? I've done that, but I don't know how to import the class from the class folder to my other class.
I put rxtxcomm.jar into jre/lib/ext folder, but I still get NoClassDefFoundError Isn't this folder automatically taken into the global classpath?
Thanks
yes it is taken automatically to classpath, but RXTXcomm uses JNI /native external libraries (.so and .dll files), you must provide the path to them when running your program in command line:
java -jar yourprogram.jar -Djava.library.path="PATH_TO_EXTERNAL_LIBRARIES"
for linux:
suppose you unpacked the rxtx.zip to
/home/user/
if you have 32bit x86 platofrm:
PATH_TO_EXTERNAL_LIBRARIES = /home/user/Linux/i686-unknown-linux-gnu/
if you have 64bit x86 platform the it would be:
PATH_TO_EXTERNAL_LIBRARIES = /home/user/Linux/x86_64-unknown-linux-gnu/
for windows:
suppose you downloaded and unpacked it to C:\rxtxt
PATH_TO_EXTERNAL_LIBRARIES = C:\rxtxt\Windows\i368-mingw32\
If you find it cumbersome to do it from command line you can do it from yout code (before opening port via RXTXcomm):
System.setProperty("java.library.path","PATH_TO_EXTERNAL_LIBRARIES");
EDIT:
of course, you must put RXTXcomm.jar in your classpath in addition to all of the above. If running from command line as jar packaged program - yourprogram.jar - inside the jar you must have a META-INF folder that contains MANIFEST.MF with the following entries:
Class-Path: lib/RXTXcomm.jar
Main-Class: pkg.Main
and yourprogram.jar must be in folder which has folder lib in which is RXTXcomm.jar, also
the class with
public static void main(String[] args)
method must be called Main and reside in package named pkg (just replace pkg.Main with whatever you have).
Then you can run your program succesfully and open a serial port if you have one. This approach also eliminates the need to copy anything in jre/lib/ext folder
EDIT^2:
or, if you don't want to pack your program in jar, position yourself in folder which contains the folder pkg and write:
java -cp PATH_TO_RXTX/RXTXcomm.jar -Djava.library.path="PATH_TO_EXTERNAL_LIBRARIES" pkg.Main
(all paths can be relative or absolute)
EDIT^3:
but I would recommend Java Simple Serial Connector instead of RXTXcomm:
it handles heavy load from multiple threads as opposed to RXTXcomm (tested in production)
external libraries are packed in jar so there is no need for setting java.library.path
I am using CMake to build a project with external libraries by using "Eclipse CDT4 - Unix Makefiles".
Importing in Eclipse leads to a working project, but only all header files and my implemented source files are recognized correctly by the index of Eclipse.
I would also like to navigate through the source files for one external library by using "ctrl+click". I don't know how to add the *.cpp files of that external library in my CMakeList.txt to get them recognized by the indexer without building the library.
You can mark the .cpp files as "header file only" like this:
# find all filenames in the lib path and gather them in $YOUR_LIB
FILE(GLOB YOUR_LIB path_to_library/*.?pp)
# create a seperate sourcegroup so it doesn't clutter up the rest of your code
SOURCE_GROUP(\\lib FILES ${YOUR_LIB})
# mark them as header-file only
SET_SOURCE_FILES_PROPERTIES(${YOUR_LIB} PROPERTIES HEADER_FILE_ONLY TRUE)
# add both your code and the lib-code to the project
ADD_EXECUTABLE(program ${YOUR_CODE} ${YOUR_LIB})
I found a way to attach external library source files to the Eclipse project that is compatible with CMake project generator.
It turns out that to indexing and "ctrl+click" navigation works correctly only when external library sources are direct descendants of the project source folder. Therefore the solution is following:
Scan external library folder for source files.
Create a child folder under project's source folder.
Symlink discovered sources inside the created folder.
I created a CMake function attachExternalSources that performs above steps:
function(attachExternalSources librarySourceLocation folderName)
# Create folder for Geant4 sources
file(MAKE_DIRECTORY ${CMAKE_SOURCE_DIR}/${folderName})
message(STATUS "Searching for C++ sources in \"${librarySourceLocation}\"...")
FILE(GLOB_RECURSE libSources
${librarySourceLocation}/*.c
${librarySourceLocation}/*.cpp
${librarySourceLocation}/*.cxx
${librarySourceLocation}/*.cc
)
message(STATUS "Symlinking sources into\n \"${CMAKE_SOURCE_DIR}/${folderName}\"\n Please wait...")
foreach(source ${libSources})
# Obtain source filename
get_filename_component(source_filename ${source} NAME)
# Create symlink unless it already exists
set(symlink "${CMAKE_SOURCE_DIR}/${folderName}/${source_filename}")
if(NOT EXISTS ${symlink})
execute_process(COMMAND ${CMAKE_COMMAND} -E create_symlink ${source} ${symlink})
endif()
endforeach()
# Scan all the symlinks created under the project folder and disable their compilation
FILE(GLOB sources_symlinks ${CMAKE_SOURCE_DIR}/${folderName}/*)
SET_SOURCE_FILES_PROPERTIES(${sources_symlinks} PROPERTIES HEADER_FILE_ONLY TRUE)
endfunction()
The use of the function is following. Paste above function code in your CMakeLists.txt. Next, use it as follows:
attachExternalSources("path/to/external/library/sources" "library-sources")
First parameter is location of the external library source code. Second argument is the name of a folder inside your project that that will contain source symlinks.
P.S. I tested function with Eclipse 4.19 and CMake 3.20.5.
I am tryin to develop a game in j2m using eclipse. To handle floating point I have downloaded the MathFp class. I did the following steps
i placed the mathFP.class file in net/jscience/math/kvm/ directory
1> Ziped the folder containig the downloaded class.
2> java build path->libraries->ADD jar->selected my zipped folder.
3> in the source code of my project i wrote import net.jscience.math.kvm.MathFP;
But when i compile it it shows NoClassDefFoundError
Ensure the relevant jar is checked in the "Java Build Path" -> "Order and Export" window.