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# Dependency Management
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Classes for managing project dependencies, dependency scopes, exclusions, and dependency management sections. These classes handle all aspects of Maven's dependency resolution and management system.
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## Capabilities
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### Dependency
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Represents a single project dependency with its coordinates, scope, and configuration options.
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```java { .api }
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public class Dependency {
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    // Core coordinates
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    public String getGroupId();
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    public void setGroupId(String groupId);
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    public String getArtifactId();
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    public void setArtifactId(String artifactId);
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    public String getVersion();
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    public void setVersion(String version);
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    public String getType();
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    public void setType(String type);
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    public String getClassifier();
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    public void setClassifier(String classifier);
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    // Dependency configuration
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    public String getScope();
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    public void setScope(String scope);
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    public String getSystemPath();
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    public void setSystemPath(String systemPath);
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    public boolean isOptional();
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    public String getOptional();
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    public void setOptional(String optional);
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    // Exclusions
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    public List<Exclusion> getExclusions();
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    public void setExclusions(List<Exclusion> exclusions);
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    public void addExclusion(Exclusion exclusion);
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    public void removeExclusion(Exclusion exclusion);
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    // Utility methods
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    public String getManagementKey();
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    public String toString();
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    public Dependency clone();
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    public InputLocation getLocation(Object key);
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    public void setLocation(Object key, InputLocation location);
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}
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```
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**Usage Example:**
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```java
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Dependency dependency = new Dependency();
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dependency.setGroupId("junit");
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dependency.setArtifactId("junit");
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dependency.setVersion("4.13.2");
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dependency.setScope("test");
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// Add exclusion
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Exclusion exclusion = new Exclusion();
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exclusion.setGroupId("org.hamcrest");
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exclusion.setArtifactId("hamcrest-core");
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dependency.addExclusion(exclusion);
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model.addDependency(dependency);
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```
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### DependencyManagement
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Container for managing default dependency versions and configurations that can be inherited by child modules.
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```java { .api }
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public class DependencyManagement {
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    public List<Dependency> getDependencies();
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    public void setDependencies(List<Dependency> dependencies);
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    public void addDependency(Dependency dependency);
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    public void removeDependency(Dependency dependency);
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    // Utility methods
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    public DependencyManagement clone();
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    public InputLocation getLocation(Object key);
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    public void setLocation(Object key, InputLocation location);
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}
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```
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**Usage Example:**
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```java
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DependencyManagement depMgmt = new DependencyManagement();
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Dependency managedDep = new Dependency();
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managedDep.setGroupId("org.springframework");
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managedDep.setArtifactId("spring-core");
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managedDep.setVersion("5.3.21");
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depMgmt.addDependency(managedDep);
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model.setDependencyManagement(depMgmt);
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```
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### Exclusion
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Represents a dependency exclusion, used to exclude transitive dependencies.
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```java { .api }
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public class Exclusion {
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    public String getGroupId();
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    public void setGroupId(String groupId);
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    public String getArtifactId();
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    public void setArtifactId(String artifactId);
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    // Utility methods
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    public String toString();
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    public Exclusion clone();
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    public InputLocation getLocation(Object key);
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    public void setLocation(Object key, InputLocation location);
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}
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```
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**Common Dependency Scopes:**
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- `compile` (default): Available in all classpaths
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- `provided`: Available at compile time but not packaged
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- `runtime`: Not needed at compile time but required at runtime
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- `test`: Only available for test compilation and execution
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- `system`: Similar to provided but must specify systemPath
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- `import`: Only used in dependencyManagement for importing POM dependencies