Fix build warnings (#938)

See #938 for details.

Author: bullet-tooth

exonum-java-binding/cryptocurrency-demo/pom.xml

@@ -184,6 +184,9 @@
           </descriptorRefs>
           <finalName>${project.artifactId}-${project.version}-artifact</finalName>
           <appendAssemblyId>false</appendAssemblyId>
+          <!-- Do not use the produced artifact jar file as a main jar
+               i.e. do not install it in the local repo -->
+          <attach>false</attach>
           <archive>
             <manifestEntries>
               <Plugin-Id>${project.groupId}:${project.artifactId}:${project.version}</Plugin-Id>

exonum-java-binding/fake-service/pom.xml

@@ -87,6 +87,9 @@
           <finalName>${project.artifactId}-artifact</finalName>
           <appendAssemblyId>false</appendAssemblyId>
           <attach>false</attach>
+          <!-- Do not use the produced artifact jar file as a main jar
+               i.e. do not install it in the local repo -->
+          <attach>false</attach>
           <archive>
             <manifestEntries>
               <Plugin-Id>${project.groupId}:${project.artifactId}:${project.version}</Plugin-Id>

exonum-java-binding/integration-tests/pom.xml

@@ -16,7 +16,9 @@
   <description>
     A module providing integration tests for Core and Time Oracle modules that require
     a node running a service. Such tests cannot be written using plain MemoryDb, hence use
-    a testkit.
+    the TestKit.
+    This module is not supposed to have sources and produce a jar file; it's created for
+    integration tests execution during the project build.
   </description>
 
   <properties>
@@ -61,10 +63,23 @@
   <build>
     <plugins>
       <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
       </plugin>
 
+      <plugin><!--Do not create an empty Jar-->
+        <artifactId>maven-jar-plugin</artifactId>
+        <configuration>
+          <skipIfEmpty>true</skipIfEmpty>
+        </configuration>
+      </plugin>
+
+      <plugin><!--Do not install Jar-->
+        <artifactId>maven-install-plugin</artifactId>
+        <configuration>
+          <skip>true</skip>
+        </configuration>
+      </plugin>
+
       <plugin>
         <artifactId>maven-surefire-plugin</artifactId>
         <configuration>
@@ -77,7 +92,6 @@
       </plugin>
 
       <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-checkstyle-plugin</artifactId>
         <configuration>
           <configLocation>${project.parent.basedir}/../checkstyle.xml</configLocation>
@@ -87,7 +101,6 @@
 
       <!-- Skip the deployment of internal module as it is inherited from parent pom -->
       <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-deploy-plugin</artifactId>
         <configuration>
           <skip>true</skip>

exonum-java-binding/packaging/pom.xml

@@ -51,12 +51,9 @@
 
       <plugin><!--Do not install Jar-->
         <artifactId>maven-install-plugin</artifactId>
-        <executions>
-          <execution>
-            <id>default-install</id>
-            <phase/>
-          </execution>
-        </executions>
+        <configuration>
+          <skip>true</skip>
+        </configuration>
       </plugin>
 
       <plugin>

exonum-java-binding/qa-service/pom.xml

@@ -207,6 +207,9 @@
           </descriptorRefs>
           <finalName>${project.artifactId}-${project.version}-artifact</finalName>
           <appendAssemblyId>false</appendAssemblyId>
+          <!-- Do not use the produced artifact jar file as a main jar
+               i.e. do not install it in the local repo -->
+          <attach>false</attach>
           <archive>
             <manifestEntries>
               <Plugin-Id>${project.groupId}:${project.artifactId}:${project.version}</Plugin-Id>

exonum-java-binding/service-archetype/src/main/resources/archetype-resources/pom.xml

@@ -142,6 +142,9 @@
           </descriptorRefs>
           <finalName>${project.artifactId}-${project.version}-artifact</finalName>
           <appendAssemblyId>false</appendAssemblyId>
+          <!-- Do not use the produced artifact jar file as a main jar
+               i.e. do not install it in the local repo -->
+          <attach>false</attach>
           <archive>
             <manifestEntries>
               <Plugin-Id>${project.groupId}:${project.artifactId}:${project.version}</Plugin-Id>