Project

General

Profile

How to Access a Maven Repository » History » Version 10

Henning Blohm, 26.03.2014 16:59

1 1 Henning Blohm
h1. Maven Repos Support
2
3
The main idea behind this concept is to hook existing Maven repositories in as component repositories. At first this is most useful for libraries, later this may be extended to other archetypes.
4
5
Maven repository suppport can be implemented in z2-base and does not require core changes.
6
7 5 Henning Blohm
h2. Principles
8 1 Henning Blohm
9 5 Henning Blohm
The main idea is that based on some root artifacts and some maven remote repository configuration, jar artifacts and dependencies will be made available as Java component in Z2 that can be referenced or included as suits best.
10
11
h2. Name mapping and version resolution
12
13 1 Henning Blohm
Artefacts in Maven repos have a fully qualified name of the form 
14
15
<pre>
16
<groupId>:<artifactId>:<version>
17
</pre>
18
19 5 Henning Blohm
or 
20 1 Henning Blohm
21 5 Henning Blohm
<pre>
22
<groupId>:<artifactId>:<packaging>:<version>
23
</pre>
24 1 Henning Blohm
25 5 Henning Blohm
By default, a jar artifact @<groupId>:<artifactId>:<version>@ will result into a Java component of name 
26 1 Henning Blohm
27
<pre>
28 5 Henning Blohm
<groupId>:<artifactId>/java
29 1 Henning Blohm
</pre>
30
31 5 Henning Blohm
Given that the resolution of the root artifacts and dependencies lead to artifacts of the same packaging, group id, and artifact id but with different versions the higher version number will be used (but see #1695).
32 1 Henning Blohm
33 5 Henning Blohm
h2. Example configuration
34
35
A maven repository component may look like this:
36
37
<pre>
38
com.zfabrik.systemStates.participation=com.zfabrik.boot.main/sysrepo_up
39
com.zfabrik.component.type=com.zfabrik.mvncr
40 9 Henning Blohm
mvncr.priority=200
41
mvncr.roots=\
42
	org.springframework:spring-context:4.0.2.RELEASE,\
43 5 Henning Blohm
	org.springframework:spring-aspects:4.0.2.RELEASE,\
44
	org.springframework:spring-tx:4.0.2.RELEASE,\
45
	org.springframework:spring-orm:4.0.2.RELEASE,\
46
	org.springframework:spring-web:4.0.2.RELEASE,\
47
	org.springframework.security:spring-security-core:3.2.2.RELEASE,\
48
	org.springframework.security:spring-security-web:3.2.2.RELEASE,\
49
	org.springframework.security:spring-security-config:3.2.2.RELEASE,\
50
	org.springframework.security:spring-security-aspects:3.2.2.RELEASE,\
51 9 Henning Blohm
	org.hibernate:hibernate-entitymanager:4.3.4.Final,\
52 1 Henning Blohm
	aopalliance:aopalliance:1.0,\
53
	org.aspectj:aspectjweaver:1.7.4,\
54
	org.aspectj:aspectjtools:1.6.9,\
55 9 Henning Blohm
56
mvncr.excluded=\
57
        org.jboss.spec.javax.transaction:jboss-transaction-api_1.2_spec
58
59
mvncr.managed=\
60
        commons-logging:commons-logging:1.1.2
61 5 Henning Blohm
</pre>
62
 
63
By default, all non-optional compile scope dependencies will be resolved. The resulting Java component will have the target artifact as API library and all non-optional compile scope dependencies as public references in their mapped form.
64
65
The z2 core will use lazy component class loaders to make sure that use of include libraries has virtually no runtime penalty.
66
67 6 Henning Blohm
68 1 Henning Blohm
h2. Fine-Tuning of the Dependency Graph
69 5 Henning Blohm
70
In order to deviate from the default resolution and mapping, maven repository roots may be specified with a query string like this:
71
72
<pre>
73 9 Henning Blohm
	org.springframework.security:spring-security-aspects:3.2.2.RELEASE?versioned=true&scope=RUNTIME&excluded=commons-logging:commons-logging:1.1.2
74 5 Henning Blohm
</pre>
75 1 Henning Blohm
76
*versioned:* If set to @true@, the version part will not be removed from the java component name mapping and instead a versioned name is used. That is, in the case above, a java component @org.springframework.security:spring-security-aspects:3.2.2.RELEASE/java@ would be mapped. This is useful if "non-default" versions are required.
77 5 Henning Blohm
78
*scope:* Any of RUNTIME, COMPILE, PROVIDED, SYSTEM, TEST. Conforms to the corresponding Maven dependency scopes. If set, non-optional dependencies of the respective scope will be traversed to resolve dependencies.
79
80 9 Henning Blohm
*excluded:* Exclusions on the dependency graph.
81
82 6 Henning Blohm
h2. Handling the impact of PROVIDED references
83
84
At times, Maven provided artifacts require the presence of artifacts on the classpath that are expected to be required by the environment - most typically this is true for Web framework w.r.t the Servlet API.
85
86 8 Henning Blohm
In that case, it is simplest to create a Z2 project representation that includes all related artifacts (or include directly). In order to simplify this include process, includes may be specified to be transitively following Java component references by adding a corresponding query modifier to the include definition:
87 1 Henning Blohm
88
<pre>
89
java.publicIncludes=\
90
	com.vaadin:vaadin-server?expand=true
91 6 Henning Blohm
</pre> 
92 9 Henning Blohm
93
h2. References
94
95 10 Henning Blohm
* Main Javadoc: "MvnRepositoryResource":http://www.z2-environment.net/javadoc/com.zfabrik.mvncr!2Fjava/impl/com/zfabrik/impl/mvncr/MvnRepositoryResource.html
96 7 Henning Blohm
97
h2. To Dos
98
99
# Handling of SNAPSHOT-Versions to be revisited