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Restore H2 database while having only a '.db' extension file

It is necessary to restore the h2 database. I have a file to recover, but its extension is .db, not .zip. I run h2 through the java -jar ./h2-1.4.190.jar -browser command. In the JDBC URL I indicate: jdbc:h2:file:/opt/backup/my.h2.db . I specify the password and login. The connection is made, I get to the database, but I don’t see my scheme. What should I do?

You shouldn't include a file name extension into JDBC URL. The valid URL for such file is jdbc:h2:/opt/backup/my;MV_STORE=FALSE;MVCC=FALSE.
Please note that 1.4.190 is a very old version, use it only if the database was really created with that version. (For the latest version of H2 exclude MVCC setting from the URL, it was removed from H2.)
Use a copy of your file. If it can't be opened normally, use a Recover Tool.
https://h2database.com/html/advanced.html#using_recover_tool

How do I solve the: Failed to load the sqljdbc_auth.dll cause is not in the java path while working in Jboss/SQL Server?

I'm new in stack overflow, I'm new to web programming.
So, I'm making a web app using JSP/servlets and I'm using java 6/jboss server.
When I try to connect to the server (I'm using the windows authentication, this means integratedSecurity=true in the string path) throws me the exception.
I already tried to put the DLL in the bin folder in the JBoss path, in system 32, and nothing seems to work. I'm using NetBeans, by the way.
Thanks for any help.

You've not added the path where sqljdbc_auth.dll is present. Find out in the system where the DLL is and add that to your classpath.
And if that also doesn't work, add the folder where the DLL is present (I'm assuming \Microsoft SQL Server JDBC Driver 3.0\sqljdbc_3.0\enu\auth\x86) to your PATH variable.
1) Download the JDBC Driver here.
2) unzip the file and go to sqljdbc_version\fra\auth\x86 or \x64
3) copy the sqljdbc_auth.dll to C:\Program Files\Java\jre_Version\bin
4) Finally restart eclipse

to resolve this problem try to change the name of dll files like is required in IDE

JDBC driver class not found error in struts-hibernate integration project

I am working on struts-hibernate integration project. When I enter data in input JSP, the output JSP shows text result as data stored in database. But actually no data is getting stored & showing the following error:
org.hibernate.HibernateException: JDBC Driver class not found: com.mysql.jdbc.Driver
1 more thing I wanna ask is a new window has popped up titled as"JLoEndpoint.class" which had message as source not found with
- The JAR file C:\program files\apache-tomcat-7.0.47\lib\tomcat-coyote.jar has no source attachment. What can I do?

First of all, be sure to have the jar containing the driver in the classpath.
If you do not have the jar, you can download it from http://mvnrepository.com/artifact/mysql/mysql-connector-java

You need to download jar containing com.mysql.jdbc.Driver you can download jar from here and set your classpath

Seems like you have not included the com.mysql.jdbc.Driver into the class path of your project.
1.First download the mysqldriver
2.if you are using the eclipse than go to Project->BuildPath->Configure Buil path -> Libraries Tab - > Add external jar and than select the mysql driver jar which you have downloaded
3. Rebuild or clean the project
4.Deploy the project again.

Can't connect to Derby database if derby.jar is in Eclipse workspace

I've been trying to create a Derby DB via Eclipse Data Tools Platform and at the beginning I couldn't manage to get it to work.. no matter what I did, I always got the same error:
Could not connect to New Derby.
Error creating SQL Model Connection connection to New Derby. (Error: null)
java.lang.NullPointerException
Error creating JDBC Connection connection to New Derby. (Error: null)
java.lang.NullPointerException
While I was trying this the derby.jar file containing the driver was inside "workspace/myproject/lib" folder. Then I put the same exact file to my Desktop, set the driver to point to the new location of my derby.jar and all started to work automagically...
I did some experiments and it happens that it works everywhere EXCEPT when I put inside my Eclipse workspace folder. Why?
And most important: if I want to deploy my application on different machines do I need the derby.jar inside my project folder (and thus inside the .jar of my project)?
Thanks in advance to everyone
EDIT: I already added derby.jar to the project through Eclipse interface, here's how:

You have to add the jar file using eclipse's interface. This website shows how:
http://www.cs.duke.edu/courses/cps004g/fall05/assign/final/addlibrary.html

database connectivity?

How to establish SQL 2005 database connectivity with Java application. Actually I don't know how to set path for JDBC. Any help would be great.

Download the jdbc driver from http://www.microsoft.com/sqlserver/2005/en/us/java-database-connectivity.aspx.
You can either download the Windows or Unix version. It does not really matter which one you use.
If you chosed the Windows version, run the downloaded exe file; this will create a directory called Microsoft SQL Server 2005 JDBC Driver in the directory you downloaded the file to.
Add the file Microsoft SQL Server 2005 JDBC Driver\sqljdbc_1.2\enu\sqljdbc.jar to your classpath (either using the -cp option of java or, if you are using an application server, by putting it in the appropriate directory).
Set your connection. Basically, the information required for this are:
the driver class name: com.microsoft.sqlserver.jdbc.SQLServerDriver
the connection url: jdbc:sqlserver://[serverName[\instanceName][:portNumber]][;property=value[;property=value]]
Check Connecting to SQL Server with the JDBC Driver for more details and/or the resources available in the help directory (sample code available in help/samples/connections/ConnectURL.java).

This is a HOWTO from Microsoft on where to get the driver and how to configure it.
Briefly, download the .jar from Microsoft, reference it in your classpath and use:
String connectionUrl = "jdbc:sqlserver://localhost:1433;" +
"databaseName=AdventureWorks;user=MyUserName;password=*****;";
Connection con = DriverManager.getConnection(connectionUrl);
substituting the relevant info.

This link will help you with this
jdbc connection mssql
Code Snippet
private java.sql.Connection getConnection(){
try{
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
con = java.sql.DriverManager.getConnection(getConnectionUrl(),userName,password);
if(con!=null) System.out.println("Connection Successful!");
}catch(Exception e){
e.printStackTrace();
System.out.println("Error Trace in getConnection() : " + e.getMessage());
}
return con;
}
private String getConnectionUrl(){
return url+serverName+":"+portNumber+";databaseName="+databaseName+";selectMethod="+selectMethod+";";
}

Your actual problem is thus that you don't know what to do with the phenomenon "classpath".
Actually, the classpath is kind of a collection of disk file system paths which points to the whole .jar file(s) and/or to some root folder with .class file(s) where the Java Virtual Machine should lookup for classes to be imported and loaded.
You can specify the classpath during compile and runtime using the -classpath or -cp argument of javac.exe and java.exe. The -cp is just a shorthand, it does nothing different. Then you have the mysterious %CLASSPATH% environment variable which you should just entirely forget. It is a poor thing which was intented to make starters easy to manage the classpath, but at end it just confused them more.
As you're using Class#forName() to load the driver, you only need to have it in the classpath during runtime, not during compiletime. So here's a basic example how to execute it:
java -cp .;c:/path/to/mssql-jdbc-driver.jar com.example.YourClass
You see, the classpath exist of two parts, the . which represents the current working directory and the c:/path/to/mssql-jdbc-driver.jar which should be the absolute path to the JAR file. The ; is just a path separator (in Windows; in Unix and clones it should be a colon :). Note: if a path contains spaces, e.g. c:/spacy path to/file.jar, then you need to wrap the individual path with doublequotes.
If you're using an IDE such as Eclipse, then normal practice is that you create a folder in the project where in you can drop all of those 3rd party JAR files which are required by the project. Create a project folder called lib, drop the JDBC driver in there and rightclick project > Properties > Java Build Path > Libraries > Add JARs > Select the JAR file which you dropped in project's lib > OK.
That should be it. Hope this helps.