I am trying to determine whether a set of strings, from an English sentence, are all words from the WordNet dictionary. I put the JARs in a folder in my project in eclipse.
I've downloaded the binary release of extJWNL and put the JARs in a folder called lib.
I also added these jar files to the class path and the module path using Right Click > Build Path > Configure Build Path:
I used the following code to try to import dictionary
import net.sf.extjwnl.dictionary;
This error is shown on the import statement
The package net.sf.extjwnl.dictionary is accessible from more than one module:
<unnamed>, extjwnl
I thought that this error was showing up because it was a package, not a class/type. But adding a new class and trying to change the package doesn't show this new package, namely WORDNET_JARS, just the default package.
Why is this error being returned and what do I need to do to get rid of the error and import the wordnet packages?
Platforms
I am using Eclipse IDE, and write all this code in Java. The API I am trying to import is the WordNet API.
Edit (8/21/2019)
By removing the module path, it gives a new error:
Only a type can be imported. net.sf.extjwnl.dictionary resolves to a package
I'm surprised it was this easy:
Instead of
import net.sf.extjwnl.dictionary
I had to do
import net.sf.extjwnl.dictionary.*
to get all the types. The only other thing that had to be done had already been done where I add the JARs to the class path
Related
I have just recently started using Eclipse and am running into problems trying to install external libraries. Following online tutorials, I add the .jar file to the classpath and I see it in the referenced libraries folder. Despite this, when trying to import, I get the error:
The package org.apache.commons is not accessible
For reference, I am trying to install the apache math commons library.
Your code probably has two issues.
First, the import statement is wrong since in Java you cannot add a package itself, but all classes of a package as follows (note .*; at the end):
import org.apache.commons.math4.linear.*;
or a specific class, e.g.
import org.apache.commons.math4.linear.FieldMatrix;
Second, you use the Java Platform Module System (JPMS) by having a module-info.java file in the default package probably without the required requires <module>; statement. JPMS was introduced in Java 9 and you have Java 12.
Do one of the following:
Delete the module-info.java file (if needed, you can recreate it via right-clicking the project folder and choosing Configure > Create module-info.java)
In module-info.java add the corresponding requires statement, e.g. by going to the line with the import statement and using the corresponding Quick Fix (Ctrl+1)
I've been trying to create my own FTP client written in Java. I wrote one ages ago in C#, so I would like to try in Java. I created a user library for apache commons and added it to my build path. The problem is that when typing the import statement it doesn't recognise it. It finds a error at org, saying "import org cannot be resolved".
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
I am using eclipse as my IDE.
Here two screenshots showing the error:
The following line is probably missing in the module-info.java file:
requires org.apache.commons.lang3;
and in the Java Build Path the Classpath contains the broken (as you can see from the red error mark) item apache-commons-lang by mistake: select it and click Remove.
Since Java 9, modules can be specified, but this requires a correct module-info.java file and the libraries must be added to the Modulepath instead of to the Classpath. Without the module-info.java file it would be easier. Therefore, perhaps the simpler solution would be to delete module-info.java file.
In addition, the *-source.jar should be as Source attachment a child of the main JAR and the *-javadoc.jar is not needed with the source (but if, then as Javadoc location child of the main JAR).
Hint: If an error or a warning is shown with a light bulb, go to the line and click Ctrl+1 and Eclipse will suggest solutions for that problem.
I'm new to java , i tried to use word net for senitment analysis .
when i used class of wordnet , i got the following failure in importing
import org.apache.felix.scr.annotations.Activate;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Deactivate;
import org.apache.felix.scr.annotations.Reference;
import org.apache.lucene.analysis.en.EnglishMinimalStemmer;
import org.apache.stanbol.commons.stanboltools.datafileprovider.DataFileListener;
import org.apache.stanbol.commons.stanboltools.datafileprovider.DataFileTracker;
import org.apache.stanbol.enhancer.engines.sentiment.api.LexicalCategoryClassifier;
import org.apache.stanbol.enhancer.engines.sentiment.api.SentimentClassifier;
import org.apache.stanbol.enhancer.engines.sentiment.util.WordSentimentDictionary;
import org.apache.stanbol.enhancer.nlp.pos.LexicalCategory;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceRegistration;
import org.osgi.service.component.ComponentContext;
all the above imports cannot be resolved like org.apache.felix , org.apache.lucene ,org.apache.stanbol,org.osgi
This is because your compiler is not able to find the necessary packages and or libraries that are needed to resolve these imports. These packages must be included in your class path. For example all of the errors regarding
org.apache.felix.scr.annotations.x
can be resolved after downloading the latest .jar from https://mvnrepository.com/artifact/org.apache.felix/org.apache.felix.scr.annotations/1.11.0
Follow these steps to include jar files in your class path.
-
Drag the required jar file from your download directory to the src
directory of your project in eclipse
Right click on the jar file, Select Build Path and then select Add To Build Path option.
A dialogue box will appear asking you to link all files in the jar file, just stick with the defaults and hit OK.
You are done now, all your errors regarding imports will be resolved.
These packages need to be within the compiler's class path.
Another way to say it : the compiler needs to be able to know where to find these files. This imposes several constraints:
these files need to actually exist in your hard drive (whether added manually, or automatically by a dependency manager)
they should be organized in folders that match the parts of the package name
the folder where they are must be within the class path, which can be specified with the 'classpath' compiler option, or in your IDE's options
I imported an external JAR to my project in Eclipse, by following these instructions:
Right click on the project > Build Path > Add external archives > Choosing the JAR file from the hard drive.
The JAR file than appears in the 'References libraries' section in my project, and works fine.
However, I never need to use the import keyword in my classes in order to use the classes from the JAR. I find this weird, I thought I'd have to use import myImportedJar or something similar for this to work.
Is it normal that I don't have to use the import keyword? Did I do something wrong?
The import statement is used to be able to refer to types and their members by their simple names. You don't need to import classes that are in the same package, unless they are nested members of other classes. This is true regardless of where the class comes from, for example, if it's in another .jar.
The import keyword works on a package level. If these packages are supplied by jars or not is not a feature of the java programming language.
import only makes a name available in unqualified form in your program. The following code fragments are identical:
java.util.List<Object> list = new java.util.ArrayList<>()
vs
import java.util.List;
import java.util.ArrayList;
List<Object> list = new ArrayList<>()
Now, importing a jar file in eclipse puts the classes from this jarfile on the classpath - the total "world" of available classes for your application.
hi all
i use the javazoom.jl.player.Player package but it is says The import javazoom cannot be resolved. i am using eclipse and doing Android project. i clean the project still the same error is shown. please correct me.
If eclipse can't resolve a package fragment of an import statement, then it tells you (with that error), that there is no library on the classpath that contains a class from that package (or from a package whose name starts with the missing part).
An easy way for standard java/eclipse:
create a folder lib in your projects root directory (with the eclipse workbench!)
copy and paste the jar into that folder
right-click the copied jar and select "add to build path".
This should eliminate the compiler errors immediately.
(Previous part of the answer)
Taking the error message literally, it looks like you have a line of code like that:
import javazoom;
This would be wrong, because we don't import packages but classes from a package. To import all classes from the javazoom package, we'd say:
import javazoom.*;
You should download the .jar of jLayer ( http://www.javazoom.net/javalayer/sources.html )
And add into classpath in the way Andreas_D told you.