Eliminate all unintentional output during build

Redirect all stdout for the test task to LogLevel.INFO, effectively
suppressing it from the default LogLevel of LIFECYCLE.

Gradle actually does this redirection during testing anyway, but for
non-main threads that exit after the test task has completed, their
output makes its way to the console.  This is why, prior to this commit
verbose 'intentional test failure' stack traces could be seen polluting
the console.

Also tuned the Xlint flags to javac on a project-by-project basis. Only
those projects that have spurious path warnings get '-path'; only those
projects with spurious deprecation warnings get '-deprecation', and so
on. This way, there's no blanket policy applied too liberally to all
projects; if path or deprecation errors crop up in a different module,
folks should see them rather than having them automatically suppressed.

build.gradle

@@ -143,14 +143,20 @@ configure(javaprojects) {
         testCompile "org.springframework:spring-test:$springVersion"
     }
 
-    // enable all compiler warnings (GRADLE-1077); eliminate path warnings
-    [compileJava, compileTestJava]*.options*.compilerArgs = ['-Xlint:all,-path']
+    // enable all compiler warnings; individual projects may customize further
+    xLintArg = '-Xlint:all'
+    [compileJava, compileTestJava]*.options*.compilerArgs = [xLintArg]
 
     // generate .classpath files without GRADLE_CACHE variable (GRADLE-1079)
     eclipseClasspath.variables = [:]
 
     // Tie pom generation into the standard build lifecycle (INT-1609)
     assemble.dependsOn generatePom
+
+    test {
+        // suppress all console output during testing unless running `gradle -i`
+        logging.captureStandardOutput(LogLevel.INFO)
+    }
 }
 
 
@@ -271,6 +277,9 @@ project('spring-integration-jdbc') {
         testCompile "org.aspectj:aspectjrt:$aspectjVersion"
         testCompile "org.aspectj:aspectjweaver:$aspectjVersion"
     }
+
+    // suppress derby localization jar path warnings during test compilation
+    compileTestJava.options.compilerArgs = ["${xLintArg},-path"]
 }
 
 project('spring-integration-jms') {
@@ -306,6 +315,9 @@ project('spring-integration-mail') {
         compile("javax.activation:activation:$javaxActivationVersion") { optional = true }
         testCompile project(":spring-integration-test")
     }
+
+    // suppress javax.activation path warnings
+    [compileJava,compileTestJava]*.options*.compilerArgs = ["${xLintArg},-path"]
 }
 
 project('spring-integration-rmi') {
@@ -315,8 +327,12 @@ project('spring-integration-rmi') {
         compile "org.springframework:spring-aop:$springVersion"
         compile "org.springframework:spring-context:$springVersion"
     }
+
+    // suppress deprecation warnings (@SuppressWarnings("deprecation") is not enough for javac)
+    compileJava.options.compilerArgs = ["${xLintArg},-deprecation"]
 }
 
+
 project('spring-integration-security') {
     description = 'Spring Integration Security Support'
     dependencies {
@@ -389,6 +405,9 @@ project('spring-integration-ws') {
         compile("javax.activation:activation:$javaxActivationVersion") { optional = true }
         testCompile project(":spring-integration-test")
     }
+
+    // suppress saaj path warnings
+    [compileJava,compileTestJava]*.options*.compilerArgs = ["${xLintArg},-path"]
 }
 
 project('spring-integration-xml') {
@@ -415,6 +434,9 @@ project('spring-integration-xmpp') {
         testCompile project(":spring-integration-test")
         testCompile project(":spring-integration-stream")
     }
+
+    // suppress smack path warnings
+    [compileJava,compileTestJava]*.options*.compilerArgs = ["${xLintArg},-path"]
 }
 
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