next development step: migration to java 1.7

This includes also a small code change to test generic type inference, a
java 1.7 feature

.settings/org.eclipse.jdt.core.prefs

@@ -6,9 +6,9 @@ org.eclipse.jdt.core.compiler.annotation.nonnullbydefault=org.eclipse.jdt.annota
 org.eclipse.jdt.core.compiler.annotation.nullable=org.eclipse.jdt.annotation.Nullable
 org.eclipse.jdt.core.compiler.annotation.nullanalysis=disabled
 org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
-org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.6
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.7
 org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
-org.eclipse.jdt.core.compiler.compliance=1.6
+org.eclipse.jdt.core.compiler.compliance=1.7
 org.eclipse.jdt.core.compiler.debug.lineNumber=generate
 org.eclipse.jdt.core.compiler.debug.localVariable=generate
 org.eclipse.jdt.core.compiler.debug.sourceFile=generate
@@ -96,4 +96,4 @@ org.eclipse.jdt.core.compiler.problem.unusedPrivateMember=warning
 org.eclipse.jdt.core.compiler.problem.unusedTypeParameter=ignore
 org.eclipse.jdt.core.compiler.problem.unusedWarningToken=warning
 org.eclipse.jdt.core.compiler.problem.varargsArgumentNeedCast=warning
-org.eclipse.jdt.core.compiler.source=1.6
+org.eclipse.jdt.core.compiler.source=1.7

build.properties

@@ -1,9 +1,9 @@
 # defining some compiler arguments
-javacSource=1.6
-javacTarget=1.6
+javacSource=1.7
+javacTarget=1.7
 
 # Release Configuration
-releaseVersion=1.72
+releaseVersion=1.73
 stdReleaseFile=yacy${branch}_v${releaseVersion}_${DSTAMP}_${releaseNr}.tar.gz
 sourceReleaseFile=yacy_src_v${releaseVersion}_${DSTAMP}_${releaseNr}.tar.gz
 releaseFileParentDir=yacy

source/net/yacy/cora/protocol/Domains.java

@@ -82,9 +82,9 @@ public class Domains {
     private static final int CONCURRENCY_LEVEL = Runtime.getRuntime().availableProcessors() * 2;
 
     // a dns cache
-    private static final ARC<String, InetAddress> NAME_CACHE_HIT = new ConcurrentARC<String, InetAddress>(MAX_NAME_CACHE_HIT_SIZE, CONCURRENCY_LEVEL);
-    private static final ARC<String, String> NAME_CACHE_MISS = new ConcurrentARC<String, String>(MAX_NAME_CACHE_MISS_SIZE, CONCURRENCY_LEVEL);
-    private static final ConcurrentHashMap<String, Object> LOOKUP_SYNC = new ConcurrentHashMap<String, Object>(100, 0.75f, Runtime.getRuntime().availableProcessors() * 2);
+    private static final ARC<String, InetAddress> NAME_CACHE_HIT = new ConcurrentARC<>(MAX_NAME_CACHE_HIT_SIZE, CONCURRENCY_LEVEL);
+    private static final ARC<String, String> NAME_CACHE_MISS = new ConcurrentARC<>(MAX_NAME_CACHE_MISS_SIZE, CONCURRENCY_LEVEL);
+    private static final ConcurrentHashMap<String, Object> LOOKUP_SYNC = new ConcurrentHashMap<>(100, 0.75f, Runtime.getRuntime().availableProcessors() * 2);
     private static       List<Pattern> nameCacheNoCachingPatterns = Collections.synchronizedList(new LinkedList<Pattern>());
     public static long cacheHit_Hit = 0, cacheHit_Miss = 0, cacheHit_Insert = 0; // for statistics only; do not write
     public static long cacheMiss_Hit = 0, cacheMiss_Miss = 0, cacheMiss_Insert = 0; // for statistics only; do not write