diff --git a/.travis.yml b/.travis.yml
index 0cc8c17..3291168 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,12 +3,18 @@ sudo: false
 cache:
   directories:
     - $HOME/.m2
-
 env:
   - JDK=oraclejdk8
 dist: trusty
 before_script:
   - jdk_switcher use $JDK
 
-script:
-  - mvn clean verify --batch-mode --errors --fail-at-end --show-version -DinstallAtEnd=true
+install: mvn clean verify -Dgpg.skip
+
+# TODO(weiguo) not tested yet
+deploy:
+  provider: script
+  script: "mvn --settings .travis/settings.xml deploy -P gpg"
+  skip_cleanup: true
+  on:
+    tags: true
diff --git a/.travis/settings.xml b/.travis/settings.xml
new file mode 100644
index 0000000..9da90d3
--- /dev/null
+++ b/.travis/settings.xml
@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
+          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">
+  <pluginGroups>
+  </pluginGroups>
+
+  <proxies>
+  </proxies>
+  <servers>
+    <server>
+      <id>sonatype_snapshots</id>
+      <username>${env.SONATYPE_USR}</username>
+      <password>${env.SONATYPE_PSWD}</password>
+    </server>
+    <server>
+      <id>sonatype_releases</id>
+      <username>${env.SONATYPE_USR}</username>
+      <password>${env.SONATYPE_PSWD}</password>
+    </server>
+  </servers>
+  <mirrors>
+  </mirrors>
+  <profiles>
+    <profile>
+      <id>gpg</id>
+      <properties>
+        <gpg.executable>gpg</gpg.executable>
+        <gpg.keyname>${env.GPG_KEYNAME}</gpg.keyname>
+        <gpg.passphrase>${env.GPG_PSWD}</gpg.passphrase>
+      </properties>
+    </profile>
+  </profiles>
+
+  <activeProfiles>
+    <activeProfile>gpg</activeProfile>
+  </activeProfiles>
+</settings>
diff --git a/pom.xml b/pom.xml
index b1ed348..be0c3c5 100644
--- a/pom.xml
+++ b/pom.xml
@@ -7,8 +7,9 @@
     <groupId>org.sqlflow</groupId>
     <artifactId>jsqlflow</artifactId>
     <packaging>jar</packaging>
-    <version>1.0-SNAPSHOT</version>
+    <version>0.0.1</version>
     <name>jsqlflow</name>
+    <description>SQLFlow client</description>
     <url>https://github.com/sql-machine-learning/jsqlflow</url>
 
     <properties>
@@ -19,6 +20,7 @@
         <maven.compiler.target>1.8</maven.compiler.target>
         <maven.compiler.source>1.8</maven.compiler.source>
     </properties>
+
     <dependencies>
         <dependency>
             <groupId>io.grpc</groupId>
@@ -69,7 +71,21 @@
                 <version>1.6.2</version>
             </extension>
         </extensions>
+
         <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-javadoc-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <id>attach-javadocs</id>
+                        <goals>
+                            <goal>jar</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+
             <plugin>
                 <groupId>org.xolstice.maven.plugins</groupId>
                 <artifactId>protobuf-maven-plugin</artifactId>
@@ -90,6 +106,7 @@
                     </execution>
                 </executions>
             </plugin>
+
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-enforcer-plugin</artifactId>
@@ -108,6 +125,81 @@
                     </execution>
                 </executions>
             </plugin>
+
+            <plugin>
+                <groupId>org.sonatype.plugins</groupId>
+                <artifactId>nexus-staging-maven-plugin</artifactId>
+                <version>1.6.8</version>
+                <extensions>true</extensions>
+                <configuration>
+                    <serverId>sonatype_releases</serverId>
+                    <nexusUrl>https://oss.sonatype.org/</nexusUrl>
+                    <autoReleaseAfterClose>false</autoReleaseAfterClose>
+                </configuration>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-source-plugin</artifactId>
+                <version>3.2.0</version>
+                <executions>
+                    <execution>
+                        <id>attach-sources</id>
+                        <goals>
+                            <goal>jar-no-fork</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-gpg-plugin</artifactId>
+                <version>1.6</version>
+                <executions>
+                    <execution>
+                        <id>gpg</id>
+                        <phase>verify</phase>
+                        <goals>
+                            <goal>sign</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>
+
+    <licenses>
+        <license>
+            <name>The Apache Software License, Version 2.0</name>
+            <url>http://www.apache.org/licenses/LICENSE-2.0.txt</url>
+            <distribution>repo</distribution>
+        </license>
+    </licenses>
+
+    <scm>
+        <url>https://github.com/sql-machine-learning/jsqlflow/tree/develop</url>
+    </scm>
+
+    <developers>
+        <developer>
+            <name>weiguoz</name>
+            <email>myxjtu@gmail.com</email>
+            <organization>http://sqlflow.org/</organization>
+            <timezone>+8</timezone>
+        </developer>
+    </developers>
+
+    <distributionManagement>
+        <repository>
+            <id>sonatype_releases</id>
+            <name>Nexus Release Repository</name>
+            <url>https://oss.sonatype.org/service/local/staging/deploy/maven2</url>
+        </repository>
+        <snapshotRepository>
+            <id>sonatype_snapshots</id>
+            <name>Nexus Snapshot Repository</name>
+            <url>https://oss.sonatype.org/content/repositories/snapshots</url>
+        </snapshotRepository>
+    </distributionManagement>
 </project>
\ No newline at end of file
diff --git a/src/main/java/org/sqlflow/client/SQLFlow.java b/src/main/java/org/sqlflow/client/SQLFlow.java
index 322275b..42e8150 100644
--- a/src/main/java/org/sqlflow/client/SQLFlow.java
+++ b/src/main/java/org/sqlflow/client/SQLFlow.java
@@ -32,12 +32,7 @@ public interface SQLFlow {
    * Submit a task to SQLFlow server. This method return immediately.
    *
    * @param session: specify dbConnStr(datasource), user Id ...
-   *     <p>datasource == maxcomputer
-   *     maxcompute://{accesskey_id}:{accesskey_secret}@{endpoint}?curr_project={curr_project}&scheme={scheme}
-   *     <p>datasource == mysql
-   *     mysql://{username}:{password}@tcp({address})/{dbname}[?param1=value1&...&paramN=valueN]
-   *     <p>datasource == hive
-   *     hive://user:password@ip:port/dbname[?auth=<auth_mechanism>&session.<cfg_key1>=<cfg_value1>...&session<cfg_keyN>=valueN]
+   *     mysql://root:root@tcp(localhost)/iris
    * @param sql: sql program.
    *     <p>Example: "SELECT * FROM iris.test; SELECT * FROM iris.iris TO TRAIN DNNClassifier
    *     COLUMN..." *