diff --git a/api/pom.xml b/api/pom.xml
index fce5cb6..ecb499a 100644
--- a/api/pom.xml
+++ b/api/pom.xml
@@ -10,8 +10,8 @@
     <modelVersion>4.0.0</modelVersion>
 
     <properties>
-        <maven.compiler.source>${java.version}</maven.compiler.source>
-        <maven.compiler.target>${java.version}</maven.compiler.target>
+        <maven.compiler.source>${jdk.version}</maven.compiler.source>
+        <maven.compiler.target>${jdk.version}</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <maven.compiler.encoding>UTF-8</maven.compiler.encoding>
     </properties>
diff --git a/example/demo/pom.xml b/demo/pom.xml
similarity index 95%
rename from example/demo/pom.xml
rename to demo/pom.xml
index a311629..d1f8d3c 100644
--- a/example/demo/pom.xml
+++ b/demo/pom.xml
@@ -6,13 +6,12 @@
         <artifactId>easysql-parent</artifactId>
         <groupId>cc.carm.lib</groupId>
         <version>0.3.16</version>
-        <relativePath>../../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
     <properties>
-        <maven.compiler.source>${java.version}</maven.compiler.source>
-        <maven.compiler.target>${java.version}</maven.compiler.target>
+        <maven.compiler.source>${jdk.version}</maven.compiler.source>
+        <maven.compiler.target>${jdk.version}</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <maven.compiler.encoding>UTF-8</maven.compiler.encoding>
         <maven.javadoc.skip>true</maven.javadoc.skip>
diff --git a/example/demo/src/main/java/EasySQLDemo.java b/demo/src/main/java/EasySQLDemo.java
similarity index 100%
rename from example/demo/src/main/java/EasySQLDemo.java
rename to demo/src/main/java/EasySQLDemo.java
diff --git a/example/demo/src/test/java/cc/carm/lib/easysql/EasySQLTest.java b/demo/src/test/java/cc/carm/lib/easysql/EasySQLTest.java
similarity index 100%
rename from example/demo/src/test/java/cc/carm/lib/easysql/EasySQLTest.java
rename to demo/src/test/java/cc/carm/lib/easysql/EasySQLTest.java
diff --git a/example/demo/src/test/java/cc/carm/lib/easysql/TestHandler.java b/demo/src/test/java/cc/carm/lib/easysql/TestHandler.java
similarity index 100%
rename from example/demo/src/test/java/cc/carm/lib/easysql/TestHandler.java
rename to demo/src/test/java/cc/carm/lib/easysql/TestHandler.java
diff --git a/example/demo/src/test/java/cc/carm/lib/easysql/tests/DeleteTest.java b/demo/src/test/java/cc/carm/lib/easysql/tests/DeleteTest.java
similarity index 100%
rename from example/demo/src/test/java/cc/carm/lib/easysql/tests/DeleteTest.java
rename to demo/src/test/java/cc/carm/lib/easysql/tests/DeleteTest.java
diff --git a/example/demo/src/test/java/cc/carm/lib/easysql/tests/QueryCloseTest.java b/demo/src/test/java/cc/carm/lib/easysql/tests/QueryCloseTest.java
similarity index 100%
rename from example/demo/src/test/java/cc/carm/lib/easysql/tests/QueryCloseTest.java
rename to demo/src/test/java/cc/carm/lib/easysql/tests/QueryCloseTest.java
diff --git a/example/demo/src/test/java/cc/carm/lib/easysql/tests/QueryFunctionTest.java b/demo/src/test/java/cc/carm/lib/easysql/tests/QueryFunctionTest.java
similarity index 100%
rename from example/demo/src/test/java/cc/carm/lib/easysql/tests/QueryFunctionTest.java
rename to demo/src/test/java/cc/carm/lib/easysql/tests/QueryFunctionTest.java
diff --git a/example/demo/src/test/java/cc/carm/lib/easysql/tests/SQLUpdateBatchTests.java b/demo/src/test/java/cc/carm/lib/easysql/tests/SQLUpdateBatchTests.java
similarity index 100%
rename from example/demo/src/test/java/cc/carm/lib/easysql/tests/SQLUpdateBatchTests.java
rename to demo/src/test/java/cc/carm/lib/easysql/tests/SQLUpdateBatchTests.java
diff --git a/example/demo/src/test/java/cc/carm/lib/easysql/tests/SQLUpdateReturnKeysTest.java b/demo/src/test/java/cc/carm/lib/easysql/tests/SQLUpdateReturnKeysTest.java
similarity index 100%
rename from example/demo/src/test/java/cc/carm/lib/easysql/tests/SQLUpdateReturnKeysTest.java
rename to demo/src/test/java/cc/carm/lib/easysql/tests/SQLUpdateReturnKeysTest.java
diff --git a/example/demo/src/test/java/cc/carm/lib/easysql/tests/TableAlterTest.java b/demo/src/test/java/cc/carm/lib/easysql/tests/TableAlterTest.java
similarity index 100%
rename from example/demo/src/test/java/cc/carm/lib/easysql/tests/TableAlterTest.java
rename to demo/src/test/java/cc/carm/lib/easysql/tests/TableAlterTest.java
diff --git a/example/demo/src/test/java/cc/carm/lib/easysql/tests/TableCreateTest.java b/demo/src/test/java/cc/carm/lib/easysql/tests/TableCreateTest.java
similarity index 100%
rename from example/demo/src/test/java/cc/carm/lib/easysql/tests/TableCreateTest.java
rename to demo/src/test/java/cc/carm/lib/easysql/tests/TableCreateTest.java
diff --git a/example/demo/src/test/java/cc/carm/lib/easysql/tests/TableRenameTest.java b/demo/src/test/java/cc/carm/lib/easysql/tests/TableRenameTest.java
similarity index 100%
rename from example/demo/src/test/java/cc/carm/lib/easysql/tests/TableRenameTest.java
rename to demo/src/test/java/cc/carm/lib/easysql/tests/TableRenameTest.java
diff --git a/impl/pom.xml b/impl/pom.xml
index 7e56645..832cb9f 100644
--- a/impl/pom.xml
+++ b/impl/pom.xml
@@ -10,8 +10,8 @@
     <modelVersion>4.0.0</modelVersion>
 
     <properties>
-        <maven.compiler.source>${java.version}</maven.compiler.source>
-        <maven.compiler.target>${java.version}</maven.compiler.target>
+        <maven.compiler.source>${jdk.version}</maven.compiler.source>
+        <maven.compiler.target>${jdk.version}</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <maven.compiler.encoding>UTF-8</maven.compiler.encoding>
     </properties>
diff --git a/pom.xml b/pom.xml
index 8c26d3d..f0a96fc 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,11 +5,13 @@
     <modelVersion>4.0.0</modelVersion>
 
     <properties>
-        <java.version>8</java.version>
-        <maven.compiler.source>${java.version}</maven.compiler.source>
-        <maven.compiler.target>${java.version}</maven.compiler.target>
+        <jdk.version>8</jdk.version>
+        <maven.compiler.source>${jdk.version}</maven.compiler.source>
+        <maven.compiler.target>${jdk.version}</maven.compiler.target>
+
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <maven.compiler.encoding>UTF-8</maven.compiler.encoding>
+
         <sonar.organization>carmjos</sonar.organization>
         <sonar.host.url>https://sonarcloud.io</sonar.host.url>
     </properties>
@@ -26,7 +28,7 @@
         <module>with-pool/beecp</module>
         <module>with-pool/hikaricp</module>
 
-        <module>example/demo</module>
+        <module>demo</module>
     </modules>
 
     <name>EasySQL</name>
@@ -196,8 +198,8 @@
                     <artifactId>maven-compiler-plugin</artifactId>
                     <version>3.10.1</version>
                     <configuration>
-                        <source>${java.version}</source>
-                        <target>${java.version}</target>
+                        <source>${jdk.version}</source>
+                        <target>${jdk.version}</target>
                         <encoding>UTF-8</encoding>
                         <compilerArgument>-parameters</compilerArgument>
                     </configuration>
diff --git a/with-pool/beecp/pom.xml b/with-pool/beecp/pom.xml
index 6c940b3..b485108 100644
--- a/with-pool/beecp/pom.xml
+++ b/with-pool/beecp/pom.xml
@@ -11,8 +11,8 @@
     <modelVersion>4.0.0</modelVersion>
 
     <properties>
-        <maven.compiler.source>${java.version}</maven.compiler.source>
-        <maven.compiler.target>${java.version}</maven.compiler.target>
+        <maven.compiler.source>${jdk.version}</maven.compiler.source>
+        <maven.compiler.target>${jdk.version}</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <maven.compiler.encoding>UTF-8</maven.compiler.encoding>
     </properties>
@@ -40,6 +40,12 @@
         <license>
             <name>The MIT License</name>
             <url>https://opensource.org/licenses/MIT</url>
+            <comments>EasySQL的基础源代码采用MIT开源协议。</comments>
+        </license>
+        <license>
+            <name>GNU Lesser General Public License v2.1</name>
+            <url>https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html</url>
+            <comments>该版本打包了BeeCP，因此相关代码继续遵循LGPL协议。</comments>
         </license>
     </licenses>
 
diff --git a/with-pool/hikaricp/pom.xml b/with-pool/hikaricp/pom.xml
index 3067812..8ce0f1d 100644
--- a/with-pool/hikaricp/pom.xml
+++ b/with-pool/hikaricp/pom.xml
@@ -11,8 +11,8 @@
     <modelVersion>4.0.0</modelVersion>
 
     <properties>
-        <maven.compiler.source>${java.version}</maven.compiler.source>
-        <maven.compiler.target>${java.version}</maven.compiler.target>
+        <maven.compiler.source>${jdk.version}</maven.compiler.source>
+        <maven.compiler.target>${jdk.version}</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <maven.compiler.encoding>UTF-8</maven.compiler.encoding>
     </properties>
@@ -39,6 +39,7 @@
         <license>
             <name>The MIT License</name>
             <url>https://opensource.org/licenses/MIT</url>
+            <comments>EasySQL与HikariCP均采用MIT开源协议。</comments>
         </license>
     </licenses>