android jdbc oracle数据库,Android Oracle Database JDBC6

姬宏江

于 2021-05-30 12:59:16 发布

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文章标签： android jdbc oracle数据库

在尝试将Oracle数据库连接从ojdbc14.jar升级到ojdbc5.jar时，遇到了Java堆内存错误和找不到类的问题。开发者试图使用新的jar文件以实现更安全的数据交换，但遇到OracleDriver类的注册MBeans失败，导致ClassNotFoundException。这可能是由于Dalvik虚拟机无法找到所需的管理工厂类。解决这个问题可能需要检查Android环境的兼容性以及确保所有依赖库都已正确导入。

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Hi i want to create a connection to my Oracle database.

i previously used ojdbc14.jar and everything was working fine, but the connection should be secure and i want to encrypt the files. so i decided to use ojdbc5.jar now.

the jar is im my "libs" folder

Reasons for changing from jdbc14 to jdbc6 i want to use Properties for a secure data exchange between my DB and my devices

earlier i also tried jdbc5 but with this i only got a java Heap Size error.

public class MainActivity extends Activity

{

@Override

protected void onCreate(Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

jdbccoonect connect = new jdbccoonect();

connect.execute();

}

@Override

public boolean onCreateOptionsMenu(Menu menu)

{

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.activity_main, menu);

return true;

}

private class jdbccoonect extends AsyncTask

{

@Override

protected Boolean doInBackground(Void... params)

{

// TODO Auto-generated method stub

String username = "scott";

String password = "tiger";

try

{

Log.d("HI","HI");

Class.forName("oracle.jdbc.OracleDriver");

//Class.forName("oracle.jdbc.driver.OracleDriver");

/*Connection conn = DriverManager

.getConnection("jdbc:oracle:thin://@10.10.0.9:1521/service",

username, password);*/

Log.d("HI","HI");

}

catch (ClassNotFoundException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

return null;

}

ERROR:

01-05 22:27:56.814: D/HI(1610): HI

01-05 22:27:57.005: E/dalvikvm(1610): Could not find class 'javax.management.MBeanServer', referenced from method oracle.jdbc.driver.OracleDriver.registerMBeans

01-05 22:27:57.005: W/dalvikvm(1610): VFY: unable to resolve check-cast 716 (Ljavax/management/MBeanServer;) in Loracle/jdbc/driver/OracleDriver;

01-05 22:27:57.005: D/dalvikvm(1610): VFY: replacing opcode 0x1f at 0x002d

01-05 22:27:57.005: I/dalvikvm(1610): Could not find method java.lang.management.ManagementFactory.getPlatformMBeanServer, referenced from method oracle.jdbc.driver.OracleDriver.registerMBeans

01-05 22:27:57.005: W/dalvikvm(1610): VFY: unable to resolve static method 3734: Ljava/lang/management/ManagementFactory;.getPlatformMBeanServer ()Ljavax/management/MBeanServer;

01-05 22:27:57.005: D/dalvikvm(1610): VFY: replacing opcode 0x71 at 0x0080

01-05 22:27:57.015: I/dalvikvm(1610): Could not find method java.lang.management.ManagementFactory.getPlatformMBeanServer, referenced from method oracle.jdbc.driver.OracleDriver.registerMBeans

01-05 22:27:57.015: W/dalvikvm(1610): VFY: unable to resolve static method 3734: Ljava/lang/management/ManagementFactory;.getPlatformMBeanServer ()Ljavax/management/MBeanServer;

01-05 22:27:57.015: D/dalvikvm(1610): VFY: replacing opcode 0x71 at 0x0094

01-05 22:27:57.015: I/dalvikvm(1610): Could not find method java.lang.management.ManagementFactory.getPlatformMBeanServer, referenced from method oracle.jdbc.driver.OracleDriver.registerMBeans

01-05 22:27:57.015: W/dalvikvm(1610): VFY: unable to resolve static method 3734: Ljava/lang/management/ManagementFactory;.getPlatformMBeanServer ()Ljavax/management/MBeanServer;

01-05 22:27:57.015: D/dalvikvm(1610): VFY: replacing opcode 0x71 at 0x00a8

01-05 22:27:57.015: I/dalvikvm(1610): Could not find method java.lang.management.ManagementFactory.getPlatformMBeanServer, referenced from method oracle.jdbc.driver.OracleDriver.registerMBeans

01-05 22:27:57.015: W/dalvikvm(1610): VFY: unable to resolve static method 3734: Ljava/lang/management/ManagementFactory;.getPlatformMBeanServer ()Ljavax/management/MBeanServer;

01-05 22:27:57.015: D/dalvikvm(1610): VFY: replacing opcode 0x71 at 0x00bc

01-05 22:27:57.015: I/dalvikvm(1610): Could not find method java.lang.management.ManagementFactory.getPlatformMBeanServer, referenced from method oracle.jdbc.driver.OracleDriver.registerMBeans

01-05 22:27:57.015: W/dalvikvm(1610): VFY: unable to resolve static method 3734: Ljava/lang/management/ManagementFactory;.getPlatformMBeanServer ()Ljavax/management/MBeanServer;

01-05 22:27:57.015: D/dalvikvm(1610): VFY: replacing opcode 0x71 at 0x00d1

01-05 22:27:57.025: W/dalvikvm(1610): VFY: unable to resolve exception class 712 (Ljavax/management/JMException;)

01-05 22:27:57.025: W/dalvikvm(1610): VFY: unable to find exception handler at addr 0xfa

01-05 22:27:57.025: W/dalvikvm(1610): VFY: rejected Loracle/jdbc/driver/OracleDriver;.registerMBeans ()V

01-05 22:27:57.025: W/dalvikvm(1610): VFY: rejecting opcode 0x0d at 0x00fa

01-05 22:27:57.025: W/dalvikvm(1610): VFY: rejected Loracle/jdbc/driver/OracleDriver;.registerMBeans ()V

01-05 22:27:57.025: W/dalvikvm(1610): Verifier rejected class Loracle/jdbc/driver/OracleDriver;

01-05 22:27:57.035: W/System.err(1610): java.lang.ClassNotFoundException: oracle.jdbc.OracleDriver

01-05 22:27:57.055: W/System.err(1610): at java.lang.Class.classForName(Native Method)

01-05 22:27:57.055: W/System.err(1610): at java.lang.Class.forName(Class.java:234)

01-05 22:27:57.055: W/System.err(1610): at java.lang.Class.forName(Class.java:181)

01-05 22:27:57.055: W/System.err(1610): at at.security.jdbcsecuritydemo.MainActivity$jdbccoonect.doInBackground(MainActivity.java:51)

01-05 22:27:57.055: W/System.err(1610): at at.security.jdbcsecuritydemo.MainActivity$jdbccoonect.doInBackground(MainActivity.java:1)

01-05 22:27:57.065: W/System.err(1610): at android.os.AsyncTask$2.call(AsyncTask.java:185)

01-05 22:27:57.065: W/System.err(1610): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)

01-05 22:27:57.065: W/System.err(1610): at java.util.concurrent.FutureTask.run(FutureTask.java:138)

01-05 22:27:57.065: W/System.err(1610): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)

01-05 22:27:57.065: W/System.err(1610): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)

01-05 22:27:57.075: W/System.err(1610): at java.lang.Thread.run(Thread.java:1019)

01-05 22:27:57.085: W/System.err(1610): Caused by: java.lang.VerifyError: oracle.jdbc.driver.OracleDriver

01-05 22:27:57.085: W/System.err(1610): ... 11 more

01-05 22:27:57.205: D/gralloc_goldfish(1610): Emulator without GPU emulation detected.