Environment: Linux, Artifactory, Java web apps, Gradle 2.12 with Spring dependency management plug-in and Flyway plug-in.
We are NOT using the Artifactory plug-in. We are just hitting it as if it were a generic maven repository.
Project is massive with something between 80 and 90 sub-projects. We have had several people working on migrating it over from Maven but there have been many headaches. We've beaten most of them but this particular series of knots is very close to sinking us.
Problems:
The build is not faster than Maven using --daemon and not --parallel. This seems pretty weird. Profiling shows that dependency resolution is taking a very long time.
Some aspect of the build is not stable. This is to say that we get various compiler issues when we try to build. This happens regardless of whether we use --parallel or not, although it happens to a greater degree with --parallel. It also happens regardless of local or remote dependencies. We suspect that it is related to some aspect of dependency resolution or perhaps as a result of unexpected exclusion behavior on the part of Gradle. Specifically, we get "Class def not found" and / or "missing symbol". Usually this seems to be related to a transitive dependency. If I put it in explicitly, the error goes away and I get a new one pertaining to a different transitive. I've experimented with putting them in as both transitive and as transitive = false.
Complicating matters, we have many BOMs. Perhaps 10? Some are ours and others belong to 3rd parties. Two or three are more than a page in length.
Without --parallel we can't seem to get the performance we need to justify the migration but we could, perhaps, survive that and wait for --parallel to finish incubating IF we could get it to build reliably. We've been cycling on --debug for about 2 weeks now but our shop is, naturally, inexperienced with Groovy and Gradle.
Clarification: It works about 30% of the time with --parallel and about 90% of the time without. If you build the specific project in question, using the full project path or changing to that sub-directory, there is no problem building.
From the --debug output, for example, I see:
...
-classpath
/development/.../build/classes/main
/development/.../build/resources/main
/home/someUser/.gradle/caches/modules-2/files-2.1/org.springframework/spring-context/4.1.7.RELEASE/8c6c02bcccfa23a74db59f7b7725e69e1af38f04/spring-context-4.1.7.RELEASE.jar
/development/.../build/libs/data-6.7.0-SNAPSHOT.jar
/home/someUser/.gradle/caches/modules-2/files-2.1/org.hibernate/hibernate-core/4.2.18.Final/2b4c72104fe1910d368d766243f0d0ac2608e134/hibernate-core-4.2.18.Final.jar
/home/someUser/.gradle/caches/modules-2/files-2.1/joda-time/joda-time/2.8.1/f5bfc718c95a7b1d3c371bb02a188a4df18361a9/joda-time-2.8.1.jar
/home/someUser/.gradle/caches/modules-2/files-2.1/commons-lang/commons-lang/2.6/ce1edb914c94ebc388f086c6827e8bdeec71ac2/commons-lang-2.6.jar
/development/.../build/libs/pnq-orgmanagement-6.7.0-SNAPSHOT.jar
/development/.../build/libs/pnq-stuffmanagement-6.7.0-SNAPSHOT.jar
/home/someUser/.gradle/caches/modules-2/files-2.1/com.pnq/pnq-someutils/6.7.0-SNAPSHOT/642a90ae7cc4f3f9b281184cacbfa1294f176df8/pnq-someutils-6.7.0-SNAPSHOT.jar
/home/someUser/.gradle/caches/modules-2/files-2.1/com.eaio.stringsearch/stringsearch/2/44618501b2fb6b2d1bb851d00b264a6eaf1fc0b0/stringsearch-2.jar
/home/someUser/.gradle/caches/modules-2/files-2.1/org.bouncycastle/bcprov-jdk15on/1.52/88a941faf9819d371e3174b5ed56a3f3f7d73269/bcprov-jdk15on-1.52.jar
/home/someUser/.gradle/caches/modules-2/files-2.1/commons-collections/commons-collections/3.2.1/761ea405b9b37ced573d2df0d1e3a4e0f9edc668/commons-collections-3.2.1.jar
/home/someUser/.gradle/caches/modules-2/files-2.1/commons-codec/commons-codec/1.10/4b95f4897fa13f2cd904aee711aeafc0c5295cd8/commons-codec-1.10.jar
/home/someUser/.gradle/caches/modules-2/files-2.1/org.springframework/spring-beans/4.1.7.RELEASE/e52148e9671e2918a2172c9cf56b77bede2042ce/spring-beans-4.1.7.RELEASE.jar
/home/someUser/.gradle/caches/modules-2/files-2.1/commons-validator/commons-validator/1.4.1/2231238e391057a53f92bde5bbc588622c1956c3/commons-validator-1.4.1.jar
/home/someUser/.gradle/caches/modules-2/files-2.1/org.springframework/spring-orm/4.1.7.RELEASE/d8923bdffe631904899875e719d8b363bc3deaea/spring-orm-4.1.7.RELEASE.jar
/home/someUser/.gradle/caches/modules-2/files-2.1/org.javolution/javolution-core-java/6.2.0rc3/5bae18008a0182d80155dbbe2c91d8907d2496d/javolution-core-java-6.2.0rc3.jar
/home/someUser/.gradle/caches/modules-2/files-2.1/org.springframework/spring-tx/4.1.7.RELEASE/3465a5d3b24006d51482cf45abd13e347f64582a/spring-tx-4.1.7.RELEASE.jar
/home/someUser/.gradle/caches/modules-2/files-2.1/org.slf4j/slf4j-api/1.6.1/6f3b8a24bf970f17289b234284c94f43eb42f0e4/slf4j-api-1.6.1.jar
/home/someUser/.gradle/caches/modules-2/files-2.1/com.pnq/pnq-batchutils/6.7.0.2/9c025552239645478a759267748c73f3e1e43a47/pnq-batchutils-6.7.0.2.jar
/development/.../build/libs/pnq-mailutils-6.7.0-SNAPSHOT.jar
/home/someUser/.gradle/caches/modules-2/files-2.1/com.pnq/pnq-utilities/6.7.0.2/d1e8ad707ebd2eddbb29eb0052c05b34acd98b46/pnq-utilities-6.7.0.2.jar
/development/.../build/libs/pnq-database-6.7.0-SNAPSHOT.jar
/home/someUser/.gradle/caches/modules-2/files-2.1/com.twilio.sdk/twilio-java-sdk/3.3.9/133f7bde99aefae1df78ecd9787e5e60bc521ad2/twilio-java-sdk-3.3.9.jar
/home/someUser/.gradle/caches/modules-2/files-2.1/org.apache.velocity/velocity/1.7/2ceb567b8f3f21118ecdec129fe1271dbc09aa7a/velocity-1.7.jar
/home/someUser/.gradle/caches/modules-2/files-2.1/javax.mail/mail/1.4.1/8b7bc69010655425dabf091b51d1e90b4de36715/mail-1.4.1.jar
/home/someUser/.gradle/caches/modules-2/files-2.1/org.apache.httpcomponents/httpclient/4.5/a1e6cbb3cc2c5f210dd1310ff9fcb2c09c0d1438/httpclient-4.5.jar
/development/.../build/libs/pnq-infoassembler-6.7.0-SNAPSHOT.jar
/development/.../build/libs/pnq-stufflookup-6.7.0-SNAPSHOT.jar
/home/someUser/.gradle/caches/modules-2/files-2.1/com.pnq/pnq-rcrtrlss/6.7.0-SNAPSHOT/58d6caa20da9035ce7b311f54915448c5bb903dc/pnq-wierdorules-6.7.0-SNAPSHOT.jar
/development/.../build/libs/pnq-cmanagement-6.7.0-SNAPSHOT.jar
/development/.../build/libs/pnq-translation-6.7.0-SNAPSHOT.jar
/development/.../build/libs/pnq-eutilities-6.7.0-SNAPSHOT.jar
/development/.../build/libs/pnq-control-6.7.0-SNAPSHOT.jar
/development/../database/build/libs/test-pnq-database-6.7.0-SNAPSHOT.jar
...
14:50:06.439 [DEBUG] [org.gradle.api.internal.artifacts.ivyservice.resolveengine.graph.DependencyGraphBuilder] junit:junit is excluded from com.project:project-enterprise-test:6.7.0.2(default).
...
st.java:3: error: package org.junit does not exist
14:50:06.481 [ERROR] [system.err] import static org.junit.Assert.assertEquals;
14:50:06.481 [ERROR] [system.err] ^
Note: A global search shows there are NO excludes for junit anywhere in the Gradle build. Also, what DON'T I see in the -classpath? Junit.
...but in the relevant build.gradle file I see:
testCompile ("com.project:project-enterprise-test")
The above is a BOM containing Maven dependencies:
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
</dependency>
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc7</artifactId>
</dependency>
<dependency>
<groupId>org.dbunit</groupId>
<artifactId>dbunit</artifactId>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-pool2</artifactId>
</dependency>
<dependency>
<groupId>org.easymock</groupId>
<artifactId>easymock</artifactId>
<exclusions>
<exclusion>
<groupId>cglib</groupId>
<artifactId>cglib-nodep</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-core</artifactId>
<exclusions>
<exclusion>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-core</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-integration</artifactId>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jul-to-slf4j</artifactId>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jcl-over-slf4j</artifactId>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
</dependency>
<dependency>
<groupId>joda-time</groupId>
<artifactId>joda-time</artifactId>
</dependency>
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-all</artifactId>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-dbcp2</artifactId>
</dependency>
<dependency>
<groupId>org.fitnesse</groupId>
<artifactId>fitlibrary</artifactId>
</dependency>
<dependency>
<groupId>javax.transaction</groupId>
<artifactId>jta</artifactId>
</dependency>
<dependency>
<groupId>javax.ws.rs</groupId>
<artifactId>jsr311-api</artifactId>
</dependency>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-bundle</artifactId>
</dependency>
<dependency>
<groupId>net.sf.dbfit</groupId>
<artifactId>dbfit</artifactId>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-jexl</artifactId>
</dependency>
<dependency>
<groupId>commons-beanutils</groupId>
<artifactId>commons-beanutils</artifactId>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>com.springsource.org.apache.commons.io</artifactId>
</dependency>
<dependency>
<groupId>javax.jms</groupId>
<artifactId>jms</artifactId>
</dependency>
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
</dependency>
<dependency>
<groupId>net.servicefixture</groupId>
<artifactId>servicefixture</artifactId>
</dependency>
</dependencies>
In the root build.gradle:
dependencyManagement {
...
imports {
mavenBom "com.project:project-enterprise-test:$bomversion"
}
...
}
It's really hard to help you if you don't include
related build.gradle snippets
the actual errors
For the dependency version mismatches, I suggest that you compare
mvn dependency:tree against gradle dependencyInsight to see what's different.
Maven and Gradle have different ways of dealing with multiple versions of the same dependency within the dependency hierarchy.
Maven uses a "nearest definition wins" strategy.
By default, Gradle will choose the latest version (or you can also define a custom ResolutionStrateegy)
Related
I'm trying to run unit tests to a Maven Plugin's Mojo using the artifact maven-plugin-testing-harness:3.3.0, with the following dependencies. But when I try to 'lookupEmptyMojo', the exception below is thrown. Any quick way to solve this configuration issue?
...
<properties>
<maven.api.version>3.6.2</maven.api.version>
<dependencies>
<!-- Maven plugin deps -->
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-plugin-api</artifactId>
<version>${maven.api.version}</version>
</dependency>
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-core</artifactId>
<version>${maven.api.version}</version>
<exclusions>
<exclusion>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
</exclusion>
</exclusions>
</dependency>
<!-- Tests -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.maven.plugin-testing</groupId>
<artifactId>maven-plugin-testing-harness</artifactId>
<version>3.3.0</version>
<scope>test</scope>
</dependency>
</dependencies>
...
Exception:
org.codehaus.plexus.component.repository.exception.ComponentLookupException: java.util.NoSuchElementException
role: org.apache.maven.repository.RepositorySystem
roleHint:
at org.codehaus.plexus.DefaultPlexusContainer.lookup(DefaultPlexusContainer.java:267)
...
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:209)
Caused by: java.util.NoSuchElementException
at org.eclipse.sisu.inject.LocatedBeans$Itr.next(LocatedBeans.java:141)
... 28 more
Coming back to report how to had fixed this issue.
I had to add two others dependencies: maven-compat and maven-resolver-api.
Test-harness uses Maven2 classes, so if we are using Maven3 we need to add the lib maven-compat with the same version of maven api that we are using; this lib implements back compatibility with the old api.
RepositorySystem is an interface present in the maven-resolver-api lib, which works with artifact repositories, that can be remote, local, or even build reactor or IDE workspace.
The dependencies were added to the pom like the following:
<dependency>
<groupId>org.apache.maven.resolver</groupId>
<artifactId>maven-resolver-api</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-compat</artifactId>
<version>${maven.api.version}</version>
<scope>test</scope>
</dependency>
I have unit tests in Java, and I want to add some information on the test to the log.
I want to do it with Maven - mvn clean install –Pstaging, and also in Jenkins
I tried to do it with Logger:
private static final Logger LOG = LoggerFactory.getLogger(S2STest.class); and then
LOG.info("message")
and Added it to the pom.xml
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.6</version>
<scope>provided</scope>
</dependency>
However, I didn't see any information when I run the test.
How I can add information to the test in Maven and Jenkins?
Jenkins doesn't include an SLF4J implementation by default. You can see that in their pom:
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4jVersion}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-nop</artifactId>
<version>${slf4jVersion}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-jdk14</artifactId>
<version>${slf4jVersion}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jcl-over-slf4j</artifactId>
<version>${slf4jVersion}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>log4j-over-slf4j</artifactId>
<version>${slf4jVersion}</version>
</dependency>
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.1.3</version>
</dependency>
So, what you need to do is include your own SLF4J implementation in your own pom, such as Log4J or Logback, OR configure it to use the slf4j-jdk14 implementation by using Logger.addHandler. In the first two cases, you will also have to configure that framework's appropriate configuration files as well.
Once you have turned on whichever of these logging frameworks you've decided, you will be able to use that configuration to generate a target for the logging information, and you will have the file. However, getting into the details of exactly how to do that is too broad of a question for Stack Overflow; I recommend picking one and reading their tutorials.
I have a project that needs to depend on a ZIP file which is produced by another project. That 'other project' is not under my control. The ZIP file is required for correctly building my project. It is not required for execution of my project. I need Maven to download the ZIP file for me.
I currently create a dependency on the ZIP artifact like this:
<dependency>
<groupId>org.foo</groupId>
<artifactId>zeus</artifactId>
<version>1.1</version>
<type>zip</type>
<scope>test</scope>
</dependency>
My problem is the scope. If I use anything but test it brings with it a lot of transitive dependencies from 'other project' which screws up my own project. Using test as the scope actually does the job but it shows in my IDE as a Test-dependency. So I feel I'm doing something wrong. This is not a test-dependency!
I've looked through the available Maven scopes ('compile', 'provided', etc) and I just cannot seem to find one that matches my use case. Am I doing something wrong?
You can just exclude all transitive dependencies with wildcard:
<dependency>
<groupId>org.foo</groupId>
<artifactId>zeus</artifactId>
<version>1.1</version>
<type>zip</type>
<scope>compile</scope>
<exclusions>
<exclusion>
<groupId>*</groupId>
<artifactId>*</artifactId>
</exclusion>
</exclusions>
</dependency>
(source Exclude all transitive dependencies of a single dependency)
You have to declare all transitive dependencies as exclusions:
<dependency>
<groupId>org.foo</groupId>
<artifactId>zeus</artifactId>
<version>1.1</version>
<type>zip</type>
<scope>compile</scope>
<exclusions>
<exclusion>
<groupId>org.foo</groupId>
<artifactId>transitive-dep-1</artifactId>
</exclusion>
<exclusion>
<groupId>org.foo</groupId>
<artifactId>transitive-dep-2</artifactId>
</exclusion>
<!-- add all transitive deps. -->
</exclusions>
</dependency>
I have read posts that seem similar, but I have not found any that lead to a solution yet.
I am editing in Eclipse Juno on Windows 7.
I have run maven clean install war:inplace from a command line in the project directory that contains two build errors. NOTE: Maven builds ProjectB successfully.
I am pretty sure both error messages are directly related.
Errors
The hierarchy of the type SomeClassB is inconsistent error on SomeClassB and
The type javax.servlet.Servlet cannot be resolved. It is indirectly referenced from required .class files on SomeClassC
The two errors appear on the code below in the class declaration line after the imports:
import foo.bar.one.a.base.SomeClassA;
import foo.bar.two.b.property.PropertyX;
public abstract class SomeClassB extends SomeClassC{
public SomeClassB() {
super();
}
#Override
protected PropertyX getPropertyX() {
return SomeClassA.getPropertyX(this.getPropName());
}
#Override
protected String getPropName() {
return SomeClassA.PROPERTY_NAME;
}
}
Some things to note:
SomeClassC is defined in another project. I will call it ProjectC
The code above is from ProjectB. The pom.xml file for ProjectB does contain a reference to ProjectC. See below code:
pom.xml
Edit: All dependencies added
<dependencies>
<dependency>
<groupId>com.ibm.ws</groupId>
<artifactId>j2ee</artifactId>
<version>7.0.0.5</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.ibm.wps</groupId>
<artifactId>com.ibm.ws.portletcontainer</artifactId>
<version>6.1.0.2</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.ibm.icu</groupId>
<artifactId>icu4j</artifactId>
<version>3.4.1</version>
</dependency>
<dependency>
<groupId>com.ibm.jsf</groupId>
<artifactId>jsf</artifactId>
<version>3.0.7</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.ibm.jsf</groupId>
<artifactId>jsf-impl-messages</artifactId>
<version>7.0.0.5</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.ibm.jsf</groupId>
<artifactId>jsf-portletbridge</artifactId>
<version>3.1.5</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.ibm.jsf</groupId>
<artifactId>jsf-ibm</artifactId>
<version>3.0.11</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.14</version>
</dependency>
<dependency>
<groupId>foo.bar.one.c</groupId>
<artifactId>foo1</artifactId>
<version>1.2.3</version>
<scope>provided</scope>
<type>jar</type>
</dependency>
<dependency>
<groupId>foo.bar.one.c</groupId>
<artifactId>foo2</artifactId>
<version>${foovar2.version}</version>
</dependency>
<dependency>
<groupId>foo.bar.one.c</groupId>
<artifactId>PropertyX</artifactId>
<version>${property.version}</version>
</dependency>
<dependency>
<groupId>foo.bar.one.c</groupId>
<artifactId>ProjectC</artifactId>
<version>${varname.version}</version>
</dependency>
<dependency>
<groupId>foo.bar.one.c</groupId>
<artifactId>foo3</artifactId>
<version>${foovar3.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>foo.bar.one.c</groupId>
<artifactId>foo4</artifactId>
<version>${foovar4.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency>
</dependencies>
<properties>
...
<varname.version>5.2.85373</varname.version>
...
</properties>
I have ensured that ProjectC and the class do indeed exist on my filesystem and that the path to it is an entry in the .classpath file for ProjectB.
A workaround I have tried is to import ProjectC into eclipse and add it to ProjectB's Java Build Path. I do not want to do this becuase that is a discouraged practice on my team.
How can I solve this problem(s)?
This happens when you run Maven from the command line.
In a nutshell, Eclipse believes that only itself changes the files under target/classes/. If you run Maven from the command line, it will change the same files and Eclipse will be very confused.
You have two options:
Use Project -> Clean to build everything again.
Configure Eclipse to use a different output folder for builds than Maven from the command line.
Provide this dependency
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency>
I got a strange error in my pom.xml. Maven (I'm using Maven 2) is signaling Missing artifact javax.jws:jsr181:jar:1.0, even if I get the corresponding dependency in my pom.xml:
<dependency>
<groupId>javax.jws</groupId>
<artifactId>jsr181</artifactId>
<version>1.0</version>
</dependency>
What could possibly be the cause of this error?
Ok, I found the solution to the problem. I think the way to find it could be interesting, too.
When I look on mvnrepository.com, the pom file on the repository pointed on an URL on bea.com, which is not available anymore. So I had to change to the maintenance release, like Brian Agnew suggested. And of course, update some other dependencies in my pom.xml, which needed the obsolete version in their own dependencies. Maven comes with a cost...
<!-- https://mvnrepository.com/artifact/javax.jws/jsr181-api -->
<dependency>
<groupId>javax.jws</groupId>
<artifactId>jsr181-api</artifactId>
<version>1.0-MR1</version>
</dependency>
<dependency>
<groupId>javax.xml.ws</groupId>
<artifactId>jaxws-api</artifactId>
<version>2.1-1</version>
<exclusions>
<exclusion>
<groupId>javax.jws</groupId>
<artifactId>jsr181</artifactId>
</exclusion>
</exclusions>
</dependency>
Looking at my repository, I think you want:
<dependency>
<groupId>sun-jaxws</groupId>
<artifactId>jsr181-api</artifactId>
<version>1.0</version>
</dependency>