Maven Error The Import Org Apache Log4j Cannot Be Resolved
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favorite Here's the background: I am a newbie to both Java and Eclipse. I am trying to write a Map-Reduce program. I am following Tom White's book: Hadoop - The definitive guide The problem: Have installed Hadoop from http://hadoop.apache.org/ as explained in Appendix A of the book. I was trying the code in Chapter 2 on weather dataset. This is where I got the compile error. I created a logger cannot be resolved eclipse project and put the three codes in Eclipse IDE: a) MaxTemperature.java b) MaxTemperatureMapper.java c) MaxTemperatureReducer.java I tried to understand the suggestions in: How to import org.apache Java dependencies w/ or w/o Maven (Raul Rene's) The import org.junit cannot be resolved I understood that using Maven will resolve my problem. But I couldn't understand how to resolve my problem. This is what I did: a) installed Maven b) Right Click on project in the package section -> Configure -> Convert to Maven Project I noticed that this created pom.xml but couldn't figure out how to resolve my issue. Please help me out. Thanks in advance. java apache maven hadoop eclipse-plugin share|improve this question asked Jan 21 '15 at 13:14 Kaushik Acharya 364318 add a comment| 2 Answers 2 active oldest votes up vote 0 down vote accepted Having installed and created a POM file is good. But it does not help to resolve the import becaus you haven't tell maven where to find the import. Add to your pom:
Things LocationTech Long-Term Support PolarSys Science OpenMDM More Community Marketplace Events Planet Eclipse Newsletter Videos Participate Report a Bug Forums Mailing Lists Wiki the import cannot be resolved maven eclipse IRC How to Contribute Working Groups Automotive Internet of Things the import org.apache.poi cannot be resolved LocationTech Long-Term Support PolarSys Science OpenMDM Toggle navigation Home Projects Forums Eclipse Community Forums Forum Search: Search download log4j jar Help Register Login Home Home» Eclipse Projects» scout» Eclipse not picking up maven Managed Dependencies(Eclipse not picking up maven Managed Dependencies) Show: Today's http://stackoverflow.com/questions/28068193/import-org-apache-cannot-be-resolved-eclipse Messages :: Show Polls :: Message Navigator Eclipse not picking up maven Managed Dependencies [message #941237] Fri, 12 October 2012 10:20 David WeberMessages: 1Registered: October 2012 Location: Zurich Junior Member I'm trying to create an application with Scout that is built with maven. Therefore, I first followed the tutorial to create the minicrm (http://wiki.eclipse.org/Scout/Tutorial/3.8/Minicrm/Minicrm_Step-by-Step) https://www.eclipse.org/forums/index.php/t/399976/ and then I followed the Maven Tycho Build tutorial (http://wiki.eclipse.org/Scout/Tutorial/3.8/Maven_Tycho_Build). At the moment I have the minicrm application that works fine when I start it in eclipse and the maven build is working as well. I am using: - Eclipse Juno Service Release 1 (Eclipse for Scout Developers, RCP Version 4.2.1.M20120914-1800, Scout Version 3.8.1.201209171521) - Maven Integration for Eclipse (Version 1.2.020120903-1050) - Tycho Project Configurators (Version 0.6.0.201207302152) - Apache Maven 3.0.4 - Java 1.7.0_04 - Windows 7, Version 6.1, Arch: Amd64 Now I want to add additional maven dependencies to my minicrm.server pom.xml. E.g. log4j dependency for logging:
they were there). I was always getting the message: import ClassName cannot be resolved. Where ClassName was my imported class. I'm using the MyEclipse Workbench 5.5.1 on Eclipse 3.2. Here are a few tips on how you http://blog.sherifmansour.com/?p=207 can fix this (some worked for me, some didn't): ‘Clean' Your Eclipse Project: Go to https://github.com/ceylon/ceylon/issues/5968 Project > Clean in Eclipse [This seems to work for me] Refresh your project folder (right click on your project > refresh) Re-build your project Clean your builds (If using Ant or Maven - clean your builds) Recreate your project in Eclipse ‘Switch' Workspace - then Switch back (Eg Change to Debug, then switch back to Java) ‘Switch' Workspace - cannot be then Switch back (Eg Change to Debug, then switch back to Java) Remove and re-add your JRE: 1. Right Click on your project > properties 2. Click on the Libraries tab 3. Click on the JRE 4. Click remove, then OK 5. Repeat 1-3 again, but add the JRE again Hope at least ONE of those tips help! Published: May 4, 2008 Filed Under: Development Tips & Tricks, Java / J2EE, Web Development Tags: eclipse : cannot be resolved java : Java / J2EE : Web Development 87 Responses to "Eclipse "Import cannot be resolved" error" « Older Comments priyanka sadhwani says: November 1, 2011 at 8:03 pm Thanks cleaning worked..:) Kalle says: November 2, 2011 at 8:50 pm Thanks a lot, "clean" worked great, good to see someone publish proper hands on tips ! Thank You sourabh says: December 2, 2011 at 1:31 pm Hi All, I tried everything mentioned above; everything from clean to refresh to switch. I am getting the error : Exception in thread "main" java.lang.Error: Unresolved compilation problems: The import com.sun.net.ssl.internal.ssl.Debug cannot be resolved Debug cannot be resolved Debug cannot be resolved Debug cannot be resolved ----------------------------- I think the trouble is with jre version , at this error I had jre1.7, and when I used 1.5 this error was gone but a new error for Javax.swing was introduced. Almost wasted two days on it. If anybody can help, it would be appreciated. Yahya says: December 6, 2011 at 3:49 am Thank you!!! … It really helped me too…I am using RAD. I cleaned the project many times but it did not solve the issue. I disabled the option - Build Atomatically' and then cleaned the project and did a manual build. The problem solved. Kan says: December 20, 2011 at 9:03 am Thanks so much! Really saved my ti
Sign in Pricing Blog Support Search GitHub This repository Watch 30 Star 173 Fork 38 ceylon/ceylon Code Issues 807 Pull requests 2 Projects 1 Wiki Pulse Graphs New issue Dependency resolution does not work correctly for Maven dependencies #5968 Open renatoathaydes opened this Issue Feb 2, 2016 · 11 comments Projects None yet Labels c-module system m-compiler-java t-bug Milestone 1.4 Assignees No one assigned 4 participants renatoathaydes commented Feb 2, 2016 Using Maven dependencies with Ceylon has been incredibly difficult. I wrote the Gradle plugin to help do that, and it works great on the surface... but there are several issues that make it not very reliable in the current state... which is what I am trying to fix. First of all, looks like Ceylon does a good job of downloading dependencies. However, it just doesn't seem to use the information about transitive dependencies when compiling at all. For example, here's a very simple example of a module that tries to use log4j: native("jvm") module com.athaydes.maven "1.0.0" { import java.base "8"; import "org.apache.logging.log4j:log4j-core" "2.4.1"; } It declares a direct dependency on log4j-core as it would do with Maven or Gradle... then, uses log4j-core in some simple code: import org.apache.logging.log4j { Logger, LogManager } import java.lang { Thread } shared class MyTest() {} Logger logger = LogManager.getLogger(`class MyTest`); "Run the module `com.athaydes.maven`." shared void run() { logger.info("Hello Maven!"); } Maven and Gradle would download the log4j-core, put it into the classpath for you along with the transitive dependencies, in this case just log4j-api, and everything would work. With Ceylon, it doesn't work out-of-the-box... you didn't say you have a dependency on log4j-api, so the Ceylon compiler