Updated README.md

README.md

@@ -1 +1,41 @@
-# ucp-native
+# ucp-native
+
+Contains a simple example which shows that usage of **com.oracle.database.jdbc:ucp:23.3.0.23.09** causes the following exception when running in a native image
+
+```text
+Exception in thread "main" java.lang.RuntimeException: java.lang.NoSuchMethodException: oracle.ucp.jdbc.proxy.oracle$1ucp$1jdbc$1proxy$1oracle$1ConnectionProxy$2oracle$1jdbc$1internal$1OracleConnection$$$Proxy.<init>(oracle.jdbc.internal.OracleConnection, java.lang.Object, oracle.ucp.proxy.ProxyFactory, java.util.Map)
+	at oracle.ucp.proxy.ProxyFactory.prepareProxy(ProxyFactory.java:170)
+	at oracle.ucp.proxy.ProxyFactory.createProxy(ProxyFactory.java:499)
+	at oracle.ucp.proxy.ProxyFactory.proxyForCreate(ProxyFactory.java:274)
+	at oracle.ucp.jdbc.proxy.oracle.OracleConnectionProxyFactory.proxyForCreate(OracleConnectionProxyFactory.java:60)
+	at oracle.ucp.jdbc.proxy.oracle.OracleConnectionProxyFactory.proxyForConnection(OracleConnectionProxyFactory.java:66)
+	at oracle.ucp.jdbc.PoolDataSourceImpl.getConnection(PoolDataSourceImpl.java:1930)
+	at oracle.ucp.jdbc.PoolDataSourceImpl$3.build(PoolDataSourceImpl.java:4256)
+	at oracle.ucp.jdbc.PoolDataSourceImpl.getConnection(PoolDataSourceImpl.java:1865)
+	at oracle.ucp.jdbc.PoolDataSourceImpl.getConnection(PoolDataSourceImpl.java:1822)
+	at oracle.ucp.jdbc.PoolDataSourceImpl.getConnection(PoolDataSourceImpl.java:1808)
+	at org.example.UcpExample.main(UcpExample.java:17)
+Caused by: java.lang.NoSuchMethodException: oracle.ucp.jdbc.proxy.oracle$1ucp$1jdbc$1proxy$1oracle$1ConnectionProxy$2oracle$1jdbc$1internal$1OracleConnection$$$Proxy.<init>(oracle.jdbc.internal.OracleConnection, java.lang.Object, oracle.ucp.proxy.ProxyFactory, java.util.Map)
+	at [email protected]/java.lang.Class.checkMethod(DynamicHub.java:1038)
+	at [email protected]/java.lang.Class.getConstructor0(DynamicHub.java:1204)
+	at [email protected]/java.lang.Class.getConstructor(DynamicHub.java:2271)
+	at oracle.ucp.proxy.ProxyFactory.prepareProxy(ProxyFactory.java:164)
+	... 10 more
+```
+
+### Reproduce steps:
+1. Start gvenzl/oracle-xe:slim-faststart container
+    ```shell
+    docker run -d --name oracle_ucp \
+    -e ORACLE_PASSWORD=ucpsystem \
+    -e APP_USER=ucptest \
+    -e APP_USER_PASSWORD=ucptest \
+    -p 1521:1521 \
+    gvenzl/oracle-xe:slim-faststart
+    ```
+2. Run
+    ```shell
+    ./gradlew clean nativeRun
+    ```
+
+If **ucp** version is changed **23.3.0.23.09** from to **21.11.0.0** in build.gradle, **./gradlew nativeRun** is successfully executed.