maven interview questions
Top maven frequently asked interview questions
I have a fork of a small open sourced library that I'm working on on github. I'd like to make it available to other developers via maven, but I don't want to run my own Nexus server, and because it's a fork I can't easily deploy it to oss.sonatype.org.
What I'd like to do is to deploy it to github so that others can access it using maven. What's the best way to do this?
Source: (StackOverflow)
I want to add the oracle jdbc driver to my project as dependency (runtime scope) - ojdbc14.
In MVNrepository site the dependency to put in the POM is:
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc14</artifactId>
<version>10.2.0.3.0</version>
</dependency>
of course this does't work as it is not in the central repository used by maven.
2 questions:
How do I find a repository (if any) that contains this artifact?
How do I add it so that Maven will use it?
Source: (StackOverflow)
I have a maven program, it compiles fine. When I run mvn test it does not run any tests (under TESTs header says There are no tests to run.).
I've recreated this problem with a super simple setup which I will include below as well as the output when run with -X.
The unit tests run fine from eclipse (both with its default junit package and when I instead include the junit.jar downloaded by maven). Also mvn test-compile correctly creates the class under test-classes. I am running this on OSX 10.6.7 with Maven 3.0.2 and java 1.6.0_24.
Here is the directory structure:
/my_program/pom.xml
/my_program/src/main/java/ClassUnderTest.java
/my_program/src/test/java/ClassUnderTestTests.java
pom.xml:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>my_group</groupId>
<artifactId>my_program</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>My Program</name>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.1</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.5</source>
<target>1.5</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
ClassUnderTest.java:
public class ClassUnderTest {
public int functionUnderTest(int n) {
return n;
}
}
ClassUnderTestTests.java:
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
public class ClassUnderTestTests {
private ClassUnderTest o;
@Before
public void setUp() {
o = new ClassUnderTest();
}
@Test
public void testFunctionUnderTest_testCase1() {
Assert.assertEquals(1, o.functionUnderTest(1));
}
@Test
public void testFunctionUnderTest_testCase2() {
Assert.assertEquals(2, o.functionUnderTest(2));
}
}
End of mvn -X test:
[DEBUG] Configuring mojo org.apache.maven.plugins:maven-surefire-plugin:2.7.1:test from plugin realm ClassRealm[plugin>org.apache.maven.plugins:maven-surefire-plugin:2.7.1, parent: sun.misc.Launcher$AppClassLoader@5224ee]
[DEBUG] Configuring mojo 'org.apache.maven.plugins:maven-surefire-plugin:2.7.1:test' with basic configurator -->
[DEBUG] (s) basedir = /Users/aaron/Programs/my_program
[DEBUG] (s) childDelegation = false
[DEBUG] (s) classesDirectory = /Users/aaron/Programs/my_program/target/classes
[DEBUG] (s) disableXmlReport = false
[DEBUG] (s) enableAssertions = true
[DEBUG] (s) forkMode = once
[DEBUG] (s) junitArtifactName = junit:junit
[DEBUG] (s) localRepository = id: local
url: file:///Users/aaron/.m2/repository/
layout: none
[DEBUG] (f) parallelMavenExecution = false
[DEBUG] (s) pluginArtifactMap = {org.apache.maven.plugins:maven-surefire-plugin=org.apache.maven.plugins:maven-surefire-plugin:maven-plugin:2.7.1:, org.apache.maven.surefire:surefire-booter=org.apache.maven.surefire:surefire-booter:jar:2.7.1:compile, org.apache.maven.surefire:surefire-api=org.apache.maven.surefire:surefire-api:jar:2.7.1:compile, org.apache.maven.surefire:maven-surefire-common=org.apache.maven.surefire:maven-surefire-common:jar:2.7.1:compile, org.apache.maven.shared:maven-common-artifact-filters=org.apache.maven.shared:maven-common-artifact-filters:jar:1.3:compile, org.codehaus.plexus:plexus-utils=org.codehaus.plexus:plexus-utils:jar:2.0.5:compile, junit:junit=junit:junit:jar:3.8.1:compile, org.apache.maven.reporting:maven-reporting-api=org.apache.maven.reporting:maven-reporting-api:jar:2.0.9:compile}
[DEBUG] (s) printSummary = true
[DEBUG] (s) project = MavenProject: my_group:my_program:1.0-SNAPSHOT @ /Users/aaron/Programs/my_program/pom.xml
[DEBUG] (s) projectArtifactMap = {junit:junit=junit:junit:jar:4.8.1:test}
[DEBUG] (s) redirectTestOutputToFile = false
[DEBUG] (s) remoteRepositories = [ id: central
url: http://repo1.maven.org/maven2
layout: default
snapshots: [enabled => false, update => daily]
releases: [enabled => true, update => never]
]
[DEBUG] (s) reportFormat = brief
[DEBUG] (s) reportsDirectory = /Users/aaron/Programs/my_program/target/surefire-reports
[DEBUG] (s) session = org.apache.maven.execution.MavenSession@dfbb43
[DEBUG] (s) skip = false
[DEBUG] (s) skipTests = false
[DEBUG] (s) testClassesDirectory = /Users/aaron/Programs/my_program/target/test-classes
[DEBUG] (s) testFailureIgnore = false
[DEBUG] (s) testNGArtifactName = org.testng:testng
[DEBUG] (s) testSourceDirectory = /Users/aaron/Programs/my_program/src/test/java
[DEBUG] (s) trimStackTrace = true
[DEBUG] (s) useFile = true
[DEBUG] (s) useManifestOnlyJar = true
[DEBUG] (s) workingDirectory = /Users/aaron/Programs/my_program
[DEBUG] -- end configuration --
[INFO] Surefire report directory: /Users/aaron/Programs/my_program/target/surefire-reports
[DEBUG] Setting system property [user.dir]=[/Users/aaron/Programs/my_program]
[DEBUG] Setting system property [localRepository]=[/Users/aaron/.m2/repository]
[DEBUG] Setting system property [basedir]=[/Users/aaron/Programs/my_program]
[DEBUG] Using JVM: /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/bin/java
[DEBUG] Using manager EnhancedLocalRepositoryManager with priority 10 for /Users/aaron/.m2/repository
[DEBUG] dummy:dummy:jar:1.0 (selected for null)
[DEBUG] org.apache.maven.surefire:surefire-booter:jar:2.7.1:compile (selected for compile)
[DEBUG] org.apache.maven.surefire:surefire-api:jar:2.7.1:compile (selected for compile)
[DEBUG] Adding to surefire booter test classpath: /Users/aaron/.m2/repository/org/apache/maven/surefire/surefire-booter/2.7.1/surefire-booter-2.7.1.jar Scope: compile
[DEBUG] Adding to surefire booter test classpath: /Users/aaron/.m2/repository/org/apache/maven/surefire/surefire-api/2.7.1/surefire-api-2.7.1.jar Scope: compile
[DEBUG] Using manager EnhancedLocalRepositoryManager with priority 10 for /Users/aaron/.m2/repository
[DEBUG] dummy:dummy:jar:1.0 (selected for null)
[DEBUG] org.apache.maven.surefire:surefire-junit4:jar:2.7.1:test (selected for test)
[DEBUG] org.apache.maven.surefire:surefire-api:jar:2.7.1:test (selected for test)
[DEBUG] Adding to surefire test classpath: /Users/aaron/.m2/repository/org/apache/maven/surefire/surefire-junit4/2.7.1/surefire-junit4-2.7.1.jar Scope: test
[DEBUG] Adding to surefire test classpath: /Users/aaron/.m2/repository/org/apache/maven/surefire/surefire-api/2.7.1/surefire-api-2.7.1.jar Scope: test
[DEBUG] Test Classpath :
[DEBUG] /Users/aaron/Programs/my_program/target/test-classes
[DEBUG] /Users/aaron/Programs/my_program/target/classes
[DEBUG] /Users/aaron/.m2/repository/junit/junit/4.8.1/junit-4.8.1.jar
[DEBUG] Using manager EnhancedLocalRepositoryManager with priority 10 for /Users/aaron/.m2/repository
[DEBUG] dummy:dummy:jar:1.0 (selected for null)
[DEBUG] org.apache.maven.surefire:surefire-booter:jar:2.7.1:compile (selected for compile)
[DEBUG] org.apache.maven.surefire:surefire-api:jar:2.7.1:compile (selected for compile)
[DEBUG] Adding to surefire booter test classpath: /Users/aaron/.m2/repository/org/apache/maven/surefire/surefire-booter/2.7.1/surefire-booter-2.7.1.jar Scope: compile
[DEBUG] Adding to surefire booter test classpath: /Users/aaron/.m2/repository/org/apache/maven/surefire/surefire-api/2.7.1/surefire-api-2.7.1.jar Scope: compile
Forking command line: /bin/sh -c cd /Users/aaron/Programs/my_program && /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/bin/java -jar /Users/aaron/Programs/my_program/target/surefire/surefirebooter6118081963679415631.jar /Users/aaron/Programs/my_program/target/surefire/surefire4887918564882595612tmp /Users/aaron/Programs/my_program/target/surefire/surefire9012255138269731406tmp
-------------------------------------------------------
T E S T S
-------------------------------------------------------
There are no tests to run.
Results :
Tests run: 0, Failures: 0, Errors: 0, Skipped: 0
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.089s
[INFO] Finished at: Mon May 30 12:03:09 EDT 2011
[INFO] Final Memory: 7M/62M
[INFO] ------------------------------------------------------------------------
Source: (StackOverflow)
In Maven, dependencies are usually set up like this:
<dependency>
<groupId>wonderful-inc</groupId>
<artifactId>dream-library</artifactId>
<version>1.2.3</version>
</dependency>
Now, if you are working with libraries that have frequent releases, constantly updating the <version> tag can be somewhat annoying. Is there any way to tell Maven to always use the latest available version (from the repository)?
Source: (StackOverflow)
Platform: IntelliJ Community Edition 10.0.3
SDK: jdk1.6.0_21
OS: Windows 7
So I have a strange situation with IntelliJ that has me completely stumped. I setup a Maven project and add log4j as a dependency in the pom.xml file. The IDEA inspections run fine and my unit tests all compile and run.
I then added hunnysoft's jmime library to my local maven repository using the mvn install:install-file as follows.
mvn install:install-file -Dfile=jmime.jar -DgroupId=jmime \
-DartifactId=jmime -Dversion=3.1.1e -Dpackaging=jar
Maven installed the jar file just fine into my local repository.
I then went into IntelliJ's Settings => Maven => Repository Services and Updated my local repository (so that IntelliJ would reindex the repository contents).
Finally, I added the following dependency to my pom.xml file (just above the log4j dependency).
<dependency>
<groupId>jmime</groupId>
<artifactId>jmime</artifactId>
<version>3.1.1e</version>
</dependency>
I now create a new class as follows:
package com.stackoverflow.question;
import org.apache.log4j.Logger;
import com.hunnysoft.jmime.ByteString;
import com.hunnysoft.jmime.Field;
import com.hunnysoft.jmime.FieldBody;
public class StackOverflowQuestion {
public Field create(String name, String text) {
Logger.getLogger(getClass()).debug("create entered");
FieldBody body = new FieldBody();
body.setText(new ByteString(text));
Field field = new Field();
field.setFieldName(name);
field.setFieldBody(body);
return field;
}
}
Now for the weirdness. IntelliJ's intention mechanism picks up and recognizes the Logger import in the maven pom file just fine. However, for all of the hunnysoft imports it reports: "Cannot resolve symbol 'ByteString/Field/FieldBody'", BUT Build => Compile 'StackOverflowQuestion.java' compiles everything correctly and the unit test I created for this class runs fine (though the intentions mark the call to create() as a problem area too).
So somewhere, somehow IntelliJ is ignoring the jmime.jar file for the intention subsystem. I'm confused because the log4j dependency works fine and everything compiles and runs fine. F12 ("Go To Declaration") works on the Logger import, but breaks on all the jmime imports.
Oh, one other thing, if I go to the 'Packages' view in the "Projects" window the "com.hunnysoft.jmime" package appears and I can see ALL of the classes I imported in the code snippet above under "Libraries". Removing the above dependency from the pom.xml file causes this package to disappear and the compilation breaks.
It appears that the inspection's classpath is broken, but there does not seem to be a setting for this anywhere in the Settings => Intentions | Compiler areas (not that I expected any such settings, I believe the IDEA should already know the correct classpath based on the pom file and JDK).
As a final experiment I created a brand new standard J2SE application project (without using maven) and added the jmime.jar file directly to the project as one of its libraries. I run into exactly the same problems as described above in this new project.
Here is the MANIFEST.MF from the jmime jar file.
Manifest-Version: 1.0
Ant-Version: Apache Ant 1.5.4
Created-By: 10.0-b23 (Sun Microsystems Inc.)
Name: com/hunnysoft/jmime/
Sealed: true
Specification-Title: Hunny JMIME
Specification-Version: 3.1.1
Specification-Vendor: Hunny Software, Inc.
Implementation-Title: com.hunnysoft.jmime
Implementation-Version: 3.1.1E
Implementation-Vendor: Hunny Software, Inc.
I don't see anything unusual in this jar file.
My best guess is that perhaps the problem might be a missing dependency issue. But AFAIK jmime is supposed to be self contained (JarAnalyzer doesn't come up with anything, but I'm not sure it would if a dependency jar is missing).
So, anyone have any IDEAs?
Source: (StackOverflow)
I'm a beginner at Maven and I've played with it from a command line point of view a little, so now I was trying to use it in Eclipse; I installed the m2eclipse plugin to do so.
But I'm stumped from the very beginning! Apparently I've missed a bit of terminology somewhere along the line. I can't keep track of all these new Maven terms... What is a Maven Project, and what is a Maven Module? These are my options when creating a new project in the Maven category in Eclipse.
Source: (StackOverflow)
Since I use Maven I have been able to build and install in my local repository projects that have incomplete java doc tags (for example, a missing parameter).
However, since I migrated to Java 8 (1.8.0-ea-b90) Maven is absolutely strict about missing documentation tags and show me lots of JavaDoc errors related to JavaDoc problems when I try to build or install a project where the JavaDoc is not "perfect". Some of the projects I am trying to compile and install in my local repository are third party projects from which I do not have control. So the workaround of just fixing all the javadocs in all these projects does not seem to be feasable in my scenario.
This is a small part of the output I see when I execute mvn clean package install in my project:
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 9.026s
[INFO] Finished at: Mon Apr 08 21:06:17 CEST 2013
[INFO] Final Memory: 27M/437M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-javadoc-plugin:2.9:jar (attach-javadocs) on project jpc: MavenReportException: Error while creating archive:
[ERROR] Exit code: 1 - /Users/sergioc/Documents/workspaces/heal/jpc/src/main/java/org/jpc/engine/prolog/PrologDatabase.java:10: error: @param name not found
[ERROR] * @param terms the terms to assert
[ERROR] ^
[ERROR] /Users/sergioc/Documents/workspaces/heal/jpc/src/main/java/org/jpc/engine/prolog/PrologDatabase.java:11: warning: no description for @return
[ERROR] * @return
[ERROR] ^
The JavaDoc plugin is configured like this in my POM:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-javadoc-plugin</artifactId>
<version>2.9</version>
<executions>
<execution>
<id>attach-javadocs</id>
<goals>
<goal>jar</goal>
</goals>
</execution>
</executions>
</plugin>
As I said before, everything is working fine if I go back to Java 7.
Maybe is this a bug related to Maven running in Java 8 ?
How could I make it work (i.e., being able to build the Javadoc of the project and install its code in my local repository) with Java 8 ?
I have tested with both Maven 3.0.3 and 3.0.5 in OSX.
UPDATE:
If I change my JavaDoc plugin configuration with <failOnError>false</failOnError> (thanks Martin):
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-javadoc-plugin</artifactId>
<version>2.9</version>
<executions>
<execution>
<id>attach-javadocs</id>
<goals>
<goal>jar</goal>
</goals>
</execution>
</executions>
</plugin>
Then the project is installed in my local repository. However, the javadoc jar is still not generated:
A fragment of the output I see in the console with this new configuration is:
[ERROR] MavenReportException: Error while creating archive: Exit
code: 1 - /Users/....java:18: warning: no @param ... Command line
was: /Library/Java/Home/bin/javadoc @options @packages
Refer to the generated Javadoc files in
'/Users/sergioc/Documents/workspaces/heal/minitoolbox/target/apidocs'
dir.
at
org.apache.maven.plugin.javadoc.AbstractJavadocMojo.executeJavadocCommandLine(AbstractJavadocMojo.java:5043)
at
org.apache.maven.plugin.javadoc.AbstractJavadocMojo.executeReport(AbstractJavadocMojo.java:1990)
at
org.apache.maven.plugin.javadoc.JavadocJar.execute(JavadocJar.java:181)
at
org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
at
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
at
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
at
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
at
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
at
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
at
org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
at
org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320) at
org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156) at
org.apache.maven.cli.MavenCli.execute(MavenCli.java:537) at
org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196) at
org.apache.maven.cli.MavenCli.main(MavenCli.java:141) at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:491) at
org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
at
org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
at
org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
at
org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Any workaround about how to build the sources, install the project and generate the Java doc jar in one step as it was working with Java 7 ?
Source: (StackOverflow)
I imported my working project on other computer so it started to download dependencies.
Apparently in the meantime my internet connection crashed. Now I get:
Build errors for comics; org.apache.maven.lifecycle.LifecycleExecutionException:
Failed to execute goal on project comicsTest: Could not resolve dependencies for project comicsTest:comicsTest:war:0.0.1-SNAPSHOT:
The following artifacts could not be resolved:
org.springframework:spring-context:jar:3.0.5.RELEASE,
org.hibernate:hibernate-entitymanager:jar:3.6.0.Final,
org.hibernate:hibernate-core:jar:3.6.0.Final,
org.hibernate:hibernate-commons-annotations:jar:3.2.0.Final,
org.aspectj:aspectjweaver:jar:1.6.8,
commons-lang:commons-lang:jar:2.5,
mysql:mysql-connector-java:jar:5.1.13: Failure to transfer org.springframework:spring-context:jar:3.0.5.RELEASE from http://repo1.maven.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced.
Original error: Could not transfer artifact org.springframework:spring-context:jar:3.0.5.RELEASE from central (http://repo1.maven.org/maven2): No response received after 60000
And I have no idea how to force maven to update?
Source: (StackOverflow)
I am trying to work with Spring Data and Neo4j. I started by trying to follow this guide linked to by the main site. In particular I based my pom.xml off of the Hello World example file. Here is a snip from my pom.xml for the plugin that is causing the issues...
<plugin>
<!-- required to resolve aspectj-enhanced class features -->
<groupId>org.codehaus.mojo</groupId>
<artifactId>aspectj-maven-plugin</artifactId>
<version>1.0</version>
<configuration>
<outxml>true</outxml>
<aspectLibraries>
<aspectLibrary>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
</aspectLibrary>
<aspectLibrary>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-neo4j</artifactId>
</aspectLibrary>
</aspectLibraries>
<source>1.6</source>
<target>1.6</target>
</configuration>
<executions>
<!-- ERROR HERE IN ECLIPSE SEE BELOW FOR FULL MESSAGE -->
<execution>
<goals>
<goal>compile</goal>
<goal>test-compile</goal>
</goals>
</execution>
</executions>
<dependencies>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>${aspectj.version}</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjtools</artifactId>
<version>${aspectj.version}</version>
</dependency>
</dependencies>
</plugin>
The error I am seeing is...
Multiple annotations found at this line:
- Plugin execution not covered by lifecycle configuration: org.codehaus.mojo:aspectj-maven-plugin:1.0:compile (execution: default, phase: process-classes)
- Plugin execution not covered by lifecycle configuration: org.codehaus.mojo:aspectj-maven-plugin:1.0:test-compile (execution: default, phase: process-classes)
I am running Eclipse 3.6.2 and m2e 0.13. I'm no Maven expert so please be very explanitory in your answers if possible.
[update] I have now also tried m2e 1.0.0 via this update site and still get the same error.
Source: (StackOverflow)
I am fairly new to maven. Have been experimenting with Nexus and Artifactory for in-house artifact repos.
With both of them, I occasionally hit an artifact that comes from some 3rd-party repo that I haven't configured yet. So, I'll get an error message from the maven client saying that an artifact can't be found. I'll go into the Nexus/Artifactory UI and set up the Virtual/Proxy repo that I need. No problem.
Then, back on my local machine, I'll run the maven client again (without -U) and get something like this:
Failure to find org.jfrog.maven.annomojo:maven-plugin-anno:jar:1.4.0
in http://myrepo:80/artifactory/repo was cached in the local
repository, resolution will not be reattempted until the update
interval of MyRepo has elapsed or updates are forced -> [Help 1]
Now, I understand what this means, and can simply re-run my command with -U, and things usually work fine from there on out. However, I find this error message to be extremely unintuitive and am trying to spare my co-workers some headaches. So I've been poking around trying to figure out if there is some place that I can modify this update interval setting. I've tried various instances of the updatePolicy tag in my settings.xml file, as well as experimenting with several of the cache period settings in Artifactory and Nexus. Nothing seems to be making any difference. Not shocking because this doesn't seem exactly related to what the updatePolicy setting seems to be for, and as for nexus/artifactory, I'm guessing that their cache timeout settings are more for how they cache failures between themselves and remote 3rd-party repositories.
So, I guess these are my questions:
- Is the
update interval that is mentioned in this error message a client-side or server-side setting?
- If client-side, how do I configure it?
- If server-side, does anyone know how/if Nexus/Artifactory expose these settings?
Source: (StackOverflow)
I have spent all day on the Maven site reading the 5- and 30-minute tutorials, and trialing Maven out for the first time.
I want to install a Maven plugin and use it to start building Maven projects from Eclipse.
Despite an honest effort, I have been unable to find a comprehensive tutorial on any Maven plugin. M2E, which seems like the de facto standard, has nothing but broken (or recursive) links on their site.
I can't tell if I even installed the plugin correctly, or how to use it.
Does anyone know of a good step-by-step guide to M2E or any other plugin? One that comes with good installation documentation, along with a solid explanation of its features and proper uses?
I can't be the only developer who has ever had this frustration. Either that or I am looking in all the wrong places...
Source: (StackOverflow)
Since I updated to Maven 3 I get the following warning messages at each build :
How can I get rid of these warnings?
[INFO] Scanning for projects...
[WARNING]
[WARNING] Some problems were encountered while building the effective model for proj:id:jar:3.1
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-javadoc-plugin is missing. @ line 195, column 15
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-compiler-plugin is missing. @ line 204, column 15
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-surefire-plugin is missing. @ line 227, column 15
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-jar-plugin is missing. @ line 215, column 15
[WARNING] 'reporting.plugins.plugin.version' for org.codehaus.mojo:jdepend-maven-plugin is missing. @ line 271, column 15
[WARNING]
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING]
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
Source: (StackOverflow)
Possible Duplicate:
How to deal with “java.lang.OutOfMemoryError: PermGen space” error
I'm getting this error while building Maven project, I increased MAVEN_OPTS but all the same, I found some similar posts but they are refering to something else. How do I fix this?
The system is out of resources.
Consult the following stack trace for details.
java.lang.OutOfMemoryError: PermGen space
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at org.codehaus.plexus.compiler.javac.IsolatedClassLoader.loadClass(IsolatedClassLoader.java:56)
at com.sun.tools.javac.comp.Annotate.<init>(Annotate.java:52)
at com.sun.tools.javac.comp.Annotate.instance(Annotate.java:36)
at com.sun.tools.javac.jvm.ClassReader.<init>(ClassReader.java:215)
at com.sun.tools.javac.jvm.ClassReader.instance(ClassReader.java:168)
at com.sun.tools.javac.main.JavaCompiler.<init>(JavaCompiler.java:293)
at com.sun.tools.javac.main.JavaCompiler.instance(JavaCompiler.java:72)
at com.sun.tools.javac.main.Main.compile(Main.java:340)
at com.sun.tools.javac.main.Main.compile(Main.java:279)
at com.sun.tools.javac.main.Main.compile(Main.java:270)
at com.sun.tools.javac.Main.compile(Main.java:87)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.codehaus.plexus.compiler.javac.JavacCompiler.compileInProcess(JavacCompiler.java:420)
at org.codehaus.plexus.compiler.javac.JavacCompiler.compile(JavacCompiler.java:141)
at org.apache.maven.plugin.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:493)
at org.apache.maven.plugin.CompilerMojo.execute(CompilerMojo.java:114)
at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:490)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:556)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:535)
Source: (StackOverflow)
I am trying to set up a project using Maven (m2eclipse), but I get this error in Eclipse:
Description Resource Path Location Type
Could not calculate build plan: Failure to transfer org.apache.maven.plugins:maven-compiler-plugin:pom:2.0.2 from http://repo1.maven.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced. Original error: Could not transfer artifact org.apache.maven.plugins:maven-compiler-plugin:pom:2.0.2 from/to central (http://repo1.maven.org/maven2): No response received after 60000 ExampleProject Unknown Maven Problem
Any ideas?
It would be helpful if you could show me how to check if everything is configured fine...
Source: (StackOverflow)