diff --git a/org.eclipse.jgit.archive/.settings/org.eclipse.jdt.core.prefs b/org.eclipse.jgit.archive/.settings/org.eclipse.jdt.core.prefs
index ff39d16ab..4e28e0b26 100644
--- a/org.eclipse.jgit.archive/.settings/org.eclipse.jdt.core.prefs
+++ b/org.eclipse.jgit.archive/.settings/org.eclipse.jdt.core.prefs
@@ -1,10 +1,10 @@
 eclipse.preferences.version=1
-org.eclipse.jdt.core.compiler.annotation.inheritNullAnnotations=disabled
+org.eclipse.jdt.core.compiler.annotation.inheritNullAnnotations=enabled
 org.eclipse.jdt.core.compiler.annotation.missingNonNullByDefaultAnnotation=ignore
 org.eclipse.jdt.core.compiler.annotation.nonnull=org.eclipse.jdt.annotation.NonNull
 org.eclipse.jdt.core.compiler.annotation.nonnullbydefault=org.eclipse.jdt.annotation.NonNullByDefault
 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.annotation.nullanalysis=enabled
 org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
 org.eclipse.jdt.core.compiler.codegen.methodParameters=do not generate
 org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.7
@@ -67,11 +67,11 @@ org.eclipse.jdt.core.compiler.problem.nonnullParameterAnnotationDropped=warning
 org.eclipse.jdt.core.compiler.problem.nullAnnotationInferenceConflict=error
 org.eclipse.jdt.core.compiler.problem.nullReference=error
 org.eclipse.jdt.core.compiler.problem.nullSpecViolation=error
-org.eclipse.jdt.core.compiler.problem.nullUncheckedConversion=warning
+org.eclipse.jdt.core.compiler.problem.nullUncheckedConversion=ignore
 org.eclipse.jdt.core.compiler.problem.overridingPackageDefaultMethod=warning
 org.eclipse.jdt.core.compiler.problem.parameterAssignment=ignore
 org.eclipse.jdt.core.compiler.problem.possibleAccidentalBooleanAssignment=error
-org.eclipse.jdt.core.compiler.problem.potentialNullReference=warning
+org.eclipse.jdt.core.compiler.problem.potentialNullReference=error
 org.eclipse.jdt.core.compiler.problem.potentiallyUnclosedCloseable=ignore
 org.eclipse.jdt.core.compiler.problem.rawTypeReference=ignore
 org.eclipse.jdt.core.compiler.problem.redundantNullAnnotation=warning
diff --git a/org.eclipse.jgit.archive/META-INF/MANIFEST.MF b/org.eclipse.jgit.archive/META-INF/MANIFEST.MF
index ecbeeef9e..98fc610bc 100644
--- a/org.eclipse.jgit.archive/META-INF/MANIFEST.MF
+++ b/org.eclipse.jgit.archive/META-INF/MANIFEST.MF
@@ -24,3 +24,4 @@ Export-Package: org.eclipse.jgit.archive;version="4.1.0";
    org.eclipse.jgit.api,
    org.apache.commons.compress.archivers,
    org.osgi.framework"
+Require-Bundle: org.eclipse.jdt.annotation;bundle-version="[1.1.0,2.0.0)";resolution:=optional
diff --git a/org.eclipse.jgit.pgm/.settings/org.eclipse.jdt.core.prefs b/org.eclipse.jgit.pgm/.settings/org.eclipse.jdt.core.prefs
index ff39d16ab..4e28e0b26 100644
--- a/org.eclipse.jgit.pgm/.settings/org.eclipse.jdt.core.prefs
+++ b/org.eclipse.jgit.pgm/.settings/org.eclipse.jdt.core.prefs
@@ -1,10 +1,10 @@
 eclipse.preferences.version=1
-org.eclipse.jdt.core.compiler.annotation.inheritNullAnnotations=disabled
+org.eclipse.jdt.core.compiler.annotation.inheritNullAnnotations=enabled
 org.eclipse.jdt.core.compiler.annotation.missingNonNullByDefaultAnnotation=ignore
 org.eclipse.jdt.core.compiler.annotation.nonnull=org.eclipse.jdt.annotation.NonNull
 org.eclipse.jdt.core.compiler.annotation.nonnullbydefault=org.eclipse.jdt.annotation.NonNullByDefault
 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.annotation.nullanalysis=enabled
 org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
 org.eclipse.jdt.core.compiler.codegen.methodParameters=do not generate
 org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.7
@@ -67,11 +67,11 @@ org.eclipse.jdt.core.compiler.problem.nonnullParameterAnnotationDropped=warning
 org.eclipse.jdt.core.compiler.problem.nullAnnotationInferenceConflict=error
 org.eclipse.jdt.core.compiler.problem.nullReference=error
 org.eclipse.jdt.core.compiler.problem.nullSpecViolation=error
-org.eclipse.jdt.core.compiler.problem.nullUncheckedConversion=warning
+org.eclipse.jdt.core.compiler.problem.nullUncheckedConversion=ignore
 org.eclipse.jdt.core.compiler.problem.overridingPackageDefaultMethod=warning
 org.eclipse.jdt.core.compiler.problem.parameterAssignment=ignore
 org.eclipse.jdt.core.compiler.problem.possibleAccidentalBooleanAssignment=error
-org.eclipse.jdt.core.compiler.problem.potentialNullReference=warning
+org.eclipse.jdt.core.compiler.problem.potentialNullReference=error
 org.eclipse.jdt.core.compiler.problem.potentiallyUnclosedCloseable=ignore
 org.eclipse.jdt.core.compiler.problem.rawTypeReference=ignore
 org.eclipse.jdt.core.compiler.problem.redundantNullAnnotation=warning
diff --git a/org.eclipse.jgit.pgm/META-INF/MANIFEST.MF b/org.eclipse.jgit.pgm/META-INF/MANIFEST.MF
index c1a905f96..55276aade 100644
--- a/org.eclipse.jgit.pgm/META-INF/MANIFEST.MF
+++ b/org.eclipse.jgit.pgm/META-INF/MANIFEST.MF
@@ -59,3 +59,4 @@ Export-Package: org.eclipse.jgit.console;version="4.1.0",
    org.kohsuke.args4j"
 Main-Class: org.eclipse.jgit.pgm.Main
 Implementation-Title: JGit Command Line Interface
+Require-Bundle: org.eclipse.jdt.annotation;bundle-version="[1.1.0,2.0.0)";resolution:=optional
diff --git a/org.eclipse.jgit/.settings/org.eclipse.jdt.core.prefs b/org.eclipse.jgit/.settings/org.eclipse.jdt.core.prefs
index ff39d16ab..32de0e9ce 100644
--- a/org.eclipse.jgit/.settings/org.eclipse.jdt.core.prefs
+++ b/org.eclipse.jgit/.settings/org.eclipse.jdt.core.prefs
@@ -1,10 +1,10 @@
 eclipse.preferences.version=1
-org.eclipse.jdt.core.compiler.annotation.inheritNullAnnotations=disabled
+org.eclipse.jdt.core.compiler.annotation.inheritNullAnnotations=enabled
 org.eclipse.jdt.core.compiler.annotation.missingNonNullByDefaultAnnotation=ignore
 org.eclipse.jdt.core.compiler.annotation.nonnull=org.eclipse.jdt.annotation.NonNull
 org.eclipse.jdt.core.compiler.annotation.nonnullbydefault=org.eclipse.jdt.annotation.NonNullByDefault
 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.annotation.nullanalysis=enabled
 org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
 org.eclipse.jdt.core.compiler.codegen.methodParameters=do not generate
 org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.7
@@ -67,7 +67,7 @@ org.eclipse.jdt.core.compiler.problem.nonnullParameterAnnotationDropped=warning
 org.eclipse.jdt.core.compiler.problem.nullAnnotationInferenceConflict=error
 org.eclipse.jdt.core.compiler.problem.nullReference=error
 org.eclipse.jdt.core.compiler.problem.nullSpecViolation=error
-org.eclipse.jdt.core.compiler.problem.nullUncheckedConversion=warning
+org.eclipse.jdt.core.compiler.problem.nullUncheckedConversion=ignore
 org.eclipse.jdt.core.compiler.problem.overridingPackageDefaultMethod=warning
 org.eclipse.jdt.core.compiler.problem.parameterAssignment=ignore
 org.eclipse.jdt.core.compiler.problem.possibleAccidentalBooleanAssignment=error
diff --git a/org.eclipse.jgit/META-INF/MANIFEST.MF b/org.eclipse.jgit/META-INF/MANIFEST.MF
index cda808c72..b696f7f9d 100644
--- a/org.eclipse.jgit/META-INF/MANIFEST.MF
+++ b/org.eclipse.jgit/META-INF/MANIFEST.MF
@@ -146,7 +146,8 @@ Export-Package: org.eclipse.jgit.api;version="4.1.0";
  org.eclipse.jgit.util.io;version="4.1.0"
 Bundle-ActivationPolicy: lazy
 Bundle-RequiredExecutionEnvironment: JavaSE-1.7
-Require-Bundle: com.jcraft.jsch;bundle-version="[0.1.37,0.2.0)"
+Require-Bundle: com.jcraft.jsch;bundle-version="[0.1.37,0.2.0)",
+ org.eclipse.jdt.annotation;bundle-version="[1.1.0,2.0.0)";resolution:=optional
 Import-Package: com.googlecode.javaewah;version="[0.7.9,0.8.0)",
  javax.crypto,
  javax.net.ssl,
diff --git a/org.eclipse.jgit/pom.xml b/org.eclipse.jgit/pom.xml
index 515dd0c74..f707d3e09 100644
--- a/org.eclipse.jgit/pom.xml
+++ b/org.eclipse.jgit/pom.xml
@@ -88,6 +88,12 @@
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-api</artifactId>
     </dependency>
+
+	<dependency>
+	    <groupId>org.eclipse.jdt</groupId>
+	    <artifactId>org.eclipse.jdt.annotation</artifactId>
+	    <version>1.1.0</version>
+	</dependency>
   </dependencies>
 
   <build>