update dubbo version to 2.7.7 (#164)

diff --git a/.travis/prepare-artifact.sh b/.travis/prepare-artifact.sh
index 2223647..01576b0 100644
--- a/.travis/prepare-artifact.sh
+++ b/.travis/prepare-artifact.sh
@@ -2,7 +2,7 @@
 env
 
 if [[ -z "${RELEASE_BRANCH}" ]]; then
-  export INTERGARTION_TEST_VERSION=2.7.7-SNAPSHOT
+  export INTERGARTION_TEST_VERSION=2.7.8-SNAPSHOT
 else
   git clone https://github.com/apache/dubbo.git
   cd dubbo
diff --git a/java/dubbo-samples-async/dubbo-samples-async-original-future/pom.xml b/java/dubbo-samples-async/dubbo-samples-async-original-future/pom.xml
index 223551c..83bd43a 100644
--- a/java/dubbo-samples-async/dubbo-samples-async-original-future/pom.xml
+++ b/java/dubbo-samples-async/dubbo-samples-async-original-future/pom.xml
@@ -31,7 +31,7 @@
     <properties>
         <source.level>1.8</source.level>
         <target.level>1.8</target.level>
-        <dubbo.version>2.7.7-SNAPSHOT</dubbo.version>
+        <dubbo.version>2.7.7</dubbo.version>
         <spring.version>4.3.16.RELEASE</spring.version>
         <junit.version>4.12</junit.version>
         <docker-maven-plugin.version>0.30.0</docker-maven-plugin.version>
diff --git a/java/dubbo-samples-http/pom.xml b/java/dubbo-samples-http/pom.xml
index 4ef4e78..cbca98c 100644
--- a/java/dubbo-samples-http/pom.xml
+++ b/java/dubbo-samples-http/pom.xml
@@ -29,7 +29,7 @@
     <properties>
         <source.level>1.8</source.level>
         <target.level>1.8</target.level>
-        <dubbo.version>2.7.7-SNAPSHOT</dubbo.version>
+        <dubbo.version>2.7.7</dubbo.version>
         <spring.version>4.3.16.RELEASE</spring.version>
         <junit.version>4.12</junit.version>
         <docker-maven-plugin.version>0.30.0</docker-maven-plugin.version>
diff --git a/java/dubbo-samples-merge/dubbo-samples-merge-consumer/pom.xml b/java/dubbo-samples-merge/dubbo-samples-merge-consumer/pom.xml
index 56aa8ed..645f4f6 100644
--- a/java/dubbo-samples-merge/dubbo-samples-merge-consumer/pom.xml
+++ b/java/dubbo-samples-merge/dubbo-samples-merge-consumer/pom.xml
@@ -29,7 +29,7 @@
     <artifactId>dubbo-samples-merge-consumer</artifactId>
 
     <properties>
-        <dubbo.version>2.7.7-SNAPSHOT</dubbo.version>
+        <dubbo.version>2.7.7</dubbo.version>
         <spring.version>4.3.16.RELEASE</spring.version>
         <junit.version>4.12</junit.version>
         <maven-failsafe-plugin.version>2.21.0</maven-failsafe-plugin.version>
diff --git a/java/dubbo-samples-merge/dubbo-samples-merge-provider1/pom.xml b/java/dubbo-samples-merge/dubbo-samples-merge-provider1/pom.xml
index b945d6c..1ac6a29 100644
--- a/java/dubbo-samples-merge/dubbo-samples-merge-provider1/pom.xml
+++ b/java/dubbo-samples-merge/dubbo-samples-merge-provider1/pom.xml
@@ -29,7 +29,7 @@
     <artifactId>dubbo-samples-merge-provider1</artifactId>
 
     <properties>
-        <dubbo.version>2.7.7-SNAPSHOT</dubbo.version>
+        <dubbo.version>2.7.7</dubbo.version>
         <jib-maven-plugin.version>1.2.0</jib-maven-plugin.version>
         <image.name>${project.artifactId}:${dubbo.version}</image.name>
         <java-image.name>openjdk:8</java-image.name>
diff --git a/java/dubbo-samples-merge/dubbo-samples-merge-provider2/pom.xml b/java/dubbo-samples-merge/dubbo-samples-merge-provider2/pom.xml
index 161c665..4944aaa 100644
--- a/java/dubbo-samples-merge/dubbo-samples-merge-provider2/pom.xml
+++ b/java/dubbo-samples-merge/dubbo-samples-merge-provider2/pom.xml
@@ -29,7 +29,7 @@
     <artifactId>dubbo-samples-merge-provider2</artifactId>
 
     <properties>
-        <dubbo.version>2.7.7-SNAPSHOT</dubbo.version>
+        <dubbo.version>2.7.7</dubbo.version>
         <jib-maven-plugin.version>1.2.0</jib-maven-plugin.version>
         <image.name>${project.artifactId}:${dubbo.version}</image.name>
         <java-image.name>openjdk:8</java-image.name>
diff --git a/java/dubbo-samples-metadata-report/dubbo-samples-metadata-report-configcenter/pom.xml b/java/dubbo-samples-metadata-report/dubbo-samples-metadata-report-configcenter/pom.xml
index cecff72..ec15e32 100644
--- a/java/dubbo-samples-metadata-report/dubbo-samples-metadata-report-configcenter/pom.xml
+++ b/java/dubbo-samples-metadata-report/dubbo-samples-metadata-report-configcenter/pom.xml
@@ -30,7 +30,7 @@
     <properties>
         <source.level>1.8</source.level>
         <target.level>1.8</target.level>
-        <dubbo.version>2.7.7-SNAPSHOT</dubbo.version>
+        <dubbo.version>2.7.7</dubbo.version>
         <spring.version>4.3.16.RELEASE</spring.version>
         <junit.version>4.12</junit.version>
         <docker-maven-plugin.version>0.30.0</docker-maven-plugin.version>
diff --git a/java/dubbo-samples-metadata-report/dubbo-samples-metadata-report-local-annotation/pom.xml b/java/dubbo-samples-metadata-report/dubbo-samples-metadata-report-local-annotation/pom.xml
index 46d595f..0e6c823 100644
--- a/java/dubbo-samples-metadata-report/dubbo-samples-metadata-report-local-annotation/pom.xml
+++ b/java/dubbo-samples-metadata-report/dubbo-samples-metadata-report-local-annotation/pom.xml
@@ -30,7 +30,7 @@
     <properties>
         <source.level>1.8</source.level>
         <target.level>1.8</target.level>
-        <dubbo.version>2.7.7-SNAPSHOT</dubbo.version>
+        <dubbo.version>2.7.7</dubbo.version>
         <spring.version>4.3.16.RELEASE</spring.version>
         <junit.version>4.12</junit.version>
         <docker-maven-plugin.version>0.30.0</docker-maven-plugin.version>
diff --git a/java/dubbo-samples-metadata-report/dubbo-samples-metadata-report-local-properties/pom.xml b/java/dubbo-samples-metadata-report/dubbo-samples-metadata-report-local-properties/pom.xml
index 508522a..e696083 100644
--- a/java/dubbo-samples-metadata-report/dubbo-samples-metadata-report-local-properties/pom.xml
+++ b/java/dubbo-samples-metadata-report/dubbo-samples-metadata-report-local-properties/pom.xml
@@ -30,7 +30,7 @@
     <properties>
         <source.level>1.8</source.level>
         <target.level>1.8</target.level>
-        <dubbo.version>2.7.7-SNAPSHOT</dubbo.version>
+        <dubbo.version>2.7.7</dubbo.version>
         <spring.version>4.3.16.RELEASE</spring.version>
         <junit.version>4.12</junit.version>
         <docker-maven-plugin.version>0.30.0</docker-maven-plugin.version>
diff --git a/java/dubbo-samples-metadata-report/dubbo-samples-metadata-report-local-xml/pom.xml b/java/dubbo-samples-metadata-report/dubbo-samples-metadata-report-local-xml/pom.xml
index 6a9b514..039de36 100644
--- a/java/dubbo-samples-metadata-report/dubbo-samples-metadata-report-local-xml/pom.xml
+++ b/java/dubbo-samples-metadata-report/dubbo-samples-metadata-report-local-xml/pom.xml
@@ -30,7 +30,7 @@
     <properties>
         <source.level>1.8</source.level>
         <target.level>1.8</target.level>
-        <dubbo.version>2.7.7-SNAPSHOT</dubbo.version>
+        <dubbo.version>2.7.7</dubbo.version>
         <spring.version>4.3.16.RELEASE</spring.version>
         <junit.version>4.12</junit.version>
         <docker-maven-plugin.version>0.30.0</docker-maven-plugin.version>
diff --git a/java/dubbo-samples-simplified-registry/dubbo-samples-simplified-registry-annotation/pom.xml b/java/dubbo-samples-simplified-registry/dubbo-samples-simplified-registry-annotation/pom.xml
index 9c53b88..078f7b7 100644
--- a/java/dubbo-samples-simplified-registry/dubbo-samples-simplified-registry-annotation/pom.xml
+++ b/java/dubbo-samples-simplified-registry/dubbo-samples-simplified-registry-annotation/pom.xml
@@ -32,7 +32,7 @@
     <properties>
         <source.level>1.8</source.level>
         <target.level>1.8</target.level>
-        <dubbo.version>2.7.7-SNAPSHOT</dubbo.version>
+        <dubbo.version>2.7.7</dubbo.version>
         <spring.version>4.3.16.RELEASE</spring.version>
         <junit.version>4.12</junit.version>
         <docker-maven-plugin.version>0.30.0</docker-maven-plugin.version>
diff --git a/java/dubbo-samples-simplified-registry/dubbo-samples-simplified-registry-nosimple/pom.xml b/java/dubbo-samples-simplified-registry/dubbo-samples-simplified-registry-nosimple/pom.xml
index 5b8a927..fe335ba 100644
--- a/java/dubbo-samples-simplified-registry/dubbo-samples-simplified-registry-nosimple/pom.xml
+++ b/java/dubbo-samples-simplified-registry/dubbo-samples-simplified-registry-nosimple/pom.xml
@@ -32,7 +32,7 @@
     <properties>
         <source.level>1.8</source.level>
         <target.level>1.8</target.level>
-        <dubbo.version>2.7.7-SNAPSHOT</dubbo.version>
+        <dubbo.version>2.7.7</dubbo.version>
         <spring.version>4.3.16.RELEASE</spring.version>
         <junit.version>4.12</junit.version>
         <docker-maven-plugin.version>0.30.0</docker-maven-plugin.version>
diff --git a/java/dubbo-samples-spring-hystrix/pom.xml b/java/dubbo-samples-spring-hystrix/pom.xml
index 27ce8f3..7380a39 100644
--- a/java/dubbo-samples-spring-hystrix/pom.xml
+++ b/java/dubbo-samples-spring-hystrix/pom.xml
@@ -29,7 +29,7 @@
     <properties>
         <source.level>1.8</source.level>
         <target.level>1.8</target.level>
-        <dubbo.version>2.7.7-SNAPSHOT</dubbo.version>
+        <dubbo.version>2.7.7</dubbo.version>
         <spring.version>4.3.16.RELEASE</spring.version>
         <hystrix.version>1.5.18</hystrix.version>
         <junit.version>4.12</junit.version>
diff --git a/java/dubbo-samples-validation/pom.xml b/java/dubbo-samples-validation/pom.xml
index 2c0ca26..6d73cbc 100644
--- a/java/dubbo-samples-validation/pom.xml
+++ b/java/dubbo-samples-validation/pom.xml
@@ -29,7 +29,7 @@
     <properties>
         <source.level>1.8</source.level>
         <target.level>1.8</target.level>
-        <dubbo.version>2.7.7-SNAPSHOT</dubbo.version>
+        <dubbo.version>2.7.7</dubbo.version>
         <spring.version>4.3.16.RELEASE</spring.version>
         <junit.version>4.12</junit.version>
         <validation.api.version>2.0.1.Final</validation.api.version>
diff --git a/java/dubbo-samples-zipkin/pom.xml b/java/dubbo-samples-zipkin/pom.xml
index 7a327a1..300bc2b 100644
--- a/java/dubbo-samples-zipkin/pom.xml
+++ b/java/dubbo-samples-zipkin/pom.xml
@@ -28,7 +28,7 @@
     <properties>
         <source.level>1.8</source.level>
         <target.level>1.8</target.level>
-        <dubbo.version>2.7.7-SNAPSHOT</dubbo.version>
+        <dubbo.version>2.7.7</dubbo.version>
         <curator.version>2.12.0</curator.version>
         <spring.version>4.3.16.RELEASE</spring.version>
         <junit.version>4.12</junit.version>