I want to deploy my Java Web Application with an internal H2 database on AWS.
I creates application-prod.properties like:
server.port=5000
spring.datasource.url=jdbc:h2:./src/main/resources/data/demo
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=sa
spring.datasource.password=
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
spring.h2.console.enabled=true
spring.h2.console.path=/h2-console
spring.h2.console.settings.trace=false
spring.h2.console.settings.web-allow-others=false
spring.h2.console.settings.trace=false
spring.jpa.hibernate.ddl-auto=none
I package my application as jar and load it up to elastic beanstack. But when I deploy, the database always disappear and I need to recreate the whole schema.
I just want to use the internal h2 database for my sample application and I want to keep the data in the database file.
Does anybody know how I can achieve this?
My application is a spring boot application based on vaadin.
Thanks and kind regards,
Nullpointer
/src/main/resources/data/demo
probably does not exist on AWS because this is the directory on your local machine and you are deploying a JAR file.
Try to point to the user home like this:
spring.datasource.url=jdbc:h2:~/demo
But be aware that if BeansTalk will recreate the application the data may be lost.
I have setup H2 as an embedded persistent database ('Embedded (Local) Database' with jdbc:h2:[file:][<path>]<databaseName>) with Spring Boot using Spring Data JPA abstraction, like below
spring.datasource.url=jdbc:h2:file:/home/data/embeddeddb;CACHE_SIZE=${spring.datasource.cache.size:131072}
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=someusr
spring.datasource.password=somepwd
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
spring.jpa.hibernate.ddl-auto=none
spring.h2.console.enabled=true
spring.h2.console.path=/h2-console
#spring.h2.console.settings.trace=false
spring.h2.console.settings.web-allow-others=true
I placed the schema.sql under my project resources and see that i am able to perform CRUD operations via the CrudRepository. I also enabled h2 console via properties as shown above.
But when i connect to the database from the h2 console using the same URL i specified (above), it does not show me the tables i have created or the configured cache size.
This even though i can use #Query methods in my CrudRepository to see that they are there.
I am not sure what i am missing here, can someone throw light on this?
Thanks
As I've read the default name of the embedded H2 database in Spring Boot should be testdb, but if I try to connect to with the H2 Console, I get the following error:
Database "mem:testdb" not found, either pre-create it or allow remote database creation (not recommended in secure environments)
It works only if I set the name explicitly in the application.properties with the following parameter:
spring.datasource.url=jdbc:h2:mem:testdb
Since the application can connect to the embedded database without this configuration, there must be a different default name. But what is the default name of the automatically configured database?
Enable h2 console in application.properties as jurez said
spring.h2.console.enabled=true
spring.h2.console.path=/h2-console
spring.jpa.show-sql=true
and then when you run the application in the console you will see something like this:
H2 console available at '/h2-console'. Database available at 'jdbc:h2:mem:2f5b7da9-0cd2-4fdd-98d2-5ef5f76391bc'
then you can use this JDBC URL to connect to the database from the h2-console
http://localhost:8080/h2-console
jdbc:h2:mem:2f5b7da9-0cd2-4fdd-98d2-5ef5f76391bc
you can specify your own name by adding the following property in the application.property file
spring.datasource.url=jdbc:h2:mem:testdb
remember since this is an in-memory database it will be dropped and recreated every time you run your application
h2 also has a persistent mode but it is not recommended, you can do that by adding the following configurations taken from the following tutorial Spring Boot and H2 in memory database - Why, What and How?
spring.datasource.name=yourdbname
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.initialize=false
spring.datasource.url=jdbc:h2:file:~/yourdbname;DB_CLOSE_ON_EXIT=FALSE;IFEXISTS=TRUE;DB_CLOSE_DELAY=-1;
spring.jpa.hibernate.ddl-auto = update
By default, memory databases are only accessible to the process in which they are running.
If you want to access it from H2 Console, you need to enable it in application.properties:
spring.h2.console.enabled=true
I have created a spring boot project in Java, it works perfectly fine with my local database but I am not able to connect it to my GCP postgres cloud SQL instance.
I have followed the below steps: https://cloud.spring.io/spring-cloud-gcp/multi/multi__spring_jdbc.html
I also did the required changes in the pom.xml.
Is there anything I need to change in the application.properties file?
spring.jpa.properties.hibernate.dialect= org.hibernate.dialect.PostgreSQLDialect
spring.jpa.hibernate.ddl-auto=none
spring.jpa.hibernate.show-sql=true
spring.datasource.url=jdbc:postgresql://localhost:5432/postgres
spring.datasource.username=postgres
spring.datasource.password=postgres
spring.datasource.initialization-mode=always
spring.datasource.initialize=true
spring.datasource.schema=classpath:/schema.sql
spring.datasource.continue-on-error=true
I want my project to working properly, pointing to cloud database.
Depend on which cloud you are using.
There is End Point for you created database.
That Endpoint link you have to put instead of Localhost.spring.datasource.url=jdbc:postgresql://(put your end point here instead of localhost):5432/postgres
Make sure that your database name should be same as in the link.
If you are using Spring there so you should first create database development environment.
Other than in Pom.xml you need to add Dependency of cloud.
If you want to access that DB then you have to go for JackDB platform.
Thanks & Regards,
JerryRank
I am simply trying to see the H2 database content for an embedded H2 database which spring-boot creates when I don't specify anything in my application.properties and start with mvn spring:run. I can see hibernate JPA creating the tables but if I try to access the h2 console at the URL below the database has no tables.
http://localhost:8080/console/
I see suggestions like this one:
View content of embedded H2 database started by Spring
But I don't know where to put the suggested XML in spring-boot and even if I did, I don't want the h2console to be available anymore when an external database is configured so it is more likely that I need to handle this with some kind of conditional code (or maybe just allow spring to automatically handle it in the most ideal case where I only include H2 when a maven profile is activated).
Does anyone have some sample code showing how to get the H2 console working in boot (and also the way to find out what the jdbc connection string that spring is using is)?
This is how I got the H2 console working in spring-boot with H2. I am not sure if this is right but since no one else has offered a solution then I am going to suggest this is the best way to do it.
In my case, I chose a specific name for the database so that I would have something to enter when starting the H2 console (in this case, "AZ"). I think all of these are required though it seems like leaving out the spring.jpa.database-platform does not hurt anything.
In application.properties:
spring.datasource.url=jdbc:h2:mem:AZ;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=sa
spring.datasource.password=
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
In Application.java (or some configuration):
#Bean
public ServletRegistrationBean h2servletRegistration() {
ServletRegistrationBean registration = new ServletRegistrationBean(new WebServlet());
registration.addUrlMappings("/console/*");
return registration;
}
Then you can access the H2 console at {server}/console/. Enter this as the JDBC URL: jdbc:h2:mem:AZ
As of Spring Boot 1.3.0.M3, the H2 console can be auto-configured.
The prerequisites are:
You are developing a web app
Spring Boot Dev Tools are enabled
H2 is on the classpath
Even if you don't use Spring Boot Dev Tools, you can still auto-configure the console by setting spring.h2.console.enabled to true
Check out this part of the documentation for all the details.
Note that when configuring in this way the console is accessible at: http://localhost:8080/h2-console/
I have found a nice tutorial about this topic:
https://springframework.guru/using-the-h2-database-console-in-spring-boot-with-spring-security/
Basically the correct JDBC URL for me was: jdbc:h2:mem:testdb
From http://docs.spring.io/spring-boot/docs/current/reference/html/common-application-properties.html
H2 Web Console (H2ConsoleProperties):
spring.h2.console.enabled=true //Enable the console.
spring.h2.console.path=/h2-console //Path at which the console will be available.
Adding the above two lines to my application.properties file was enough to access the H2 database web console, using the default username (sa) and password (empty, as in don't enter a password when the ui prompts you).
A similar answer with Step by Step guide.
Add Developer tools dependency to your pom.xml or build.gradle
Maven
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>
</dependencies>
Gradle
dependencies {
compile("org.springframework.boot:spring-boot-devtools")
}
Access the db from http://localhost:8080/h2-console/
Specify jdbc:h2:mem:testdb as JDBC URL
You should see the entity you specified in your project as a table.
For Spring Boot 2.1.1 straight from Spring Initialzr:
Default with devtools is http://127.0.0.1:8080/h2-console/
POM: spring-boot-starter, h2, spring-boot-starter-web, spring-boot-devtools
Without devtools - you need to set it in properties: spring.h2.console.enabled=true spring.h2.console.path=/h2-console
POM: spring-boot-starter, h2, spring-boot-starter-web
Once you get there - set JDBC URL: jdbc:h2:mem:testdb (The default one will not work)
I had only below properties in /resources/application.properties. After running spring boot, using this URL(http://localhost:8080/h2-console/), the table in H2 console was visible and read to view the table data, also you can run simple SQL commands. One thing, in your java code, while fetching data, the column names are upper-case, even though schema.sql is using lower-case names :)
spring.datasource.initialize=true
spring.datasource.url=jdbc:h2:mem:testdb;DB_CLOSE_DELAY=- 1;DB_CLOSE_ON_EXIT=FALSE
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=sa
spring.datasource.password=
spring.h2.console.enabled=true
Check spring application.properties
spring.datasource.url=jdbc:h2:mem:testdb;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE
here testdb is database defined
Make sure h2 console have same value while connecting other wise it will connect to default db
For Spring Boot 2.3.3.RELEASE straight from Spring Initialzr:
POM: data jpa, h2, web
application properties: spring.h2.console.enabled=true
When you run the application look for line like below in the run console:
2020-08-18 21:12:32.664 INFO 63256 --- [ main] o.s.b.a.h2.H2ConsoleAutoConfiguration : H2 console available at '/h2-console'. Database available at 'jdbc:h2:mem:eaa9d6da-aa2e-4ad3-9e5b-2b60eb2fcbc5'
Now use the above JDBC URL for h2-console and click on Connect.
If you use Spring Boot's developer tools, it comes with H2 Console enabled by default. It can be accessed from /h2-console/. On the login interface, for input JDBC URL use value jdbc:h2:mem:testdb. Pay attention to mem string.
If you don't use Spring Boot's developer tools, you can enable the console in application.properties using spring.h2.console.enabled=true. This will enable console under /h2-console. If you want to change the URL then you can add another entry with spring.h2.console.path=my_console_path.
The default schema name is testdb.
More details in Spring Boot Documentation.
In order to get the tables all you need to do is create 2 sql files schema.sql(for table creation) and data.sql(data for the created tables). These files to be put in src/main/resources folder. Spring boot auto detects them and takes care of the rest during runtime.
If your using more than 2 DB in your project ensure to use specific files like (schema-h2.sql -- for h2 DB , schema-oracle.sql -- for oracle DB). The same to be followed for data.sql too.
Also ensure that you drop tables by adding drop table statement in your schema.sql as first statement. To avoid appending of duplicate records.
The link for spring boot is here.
My application.properties is as follows.
spring.datasource.url=jdbc:h2:~/file/Shiva;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE
spring.datasource.driver-class-name=org.h2.Driver
spring.datasource.username=sa
spring.datasource.password=
spring.datasource.platform=h2
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
spring.h2.console.enabled=true
spring.datasource.initialize=true
spring.error.whitelabel.enabled=true
spring.h2.console.path=/console
spring.datasource.continue-on-error=true
spring.jpa.hibernate.ddl-auto=create
spring.hibernate.hbm2ddl.auto=update
spring.hibernate.show_sql=true
You can follow the steps in the below link.
https://springframework.guru/using-the-h2-database-console-in-spring-boot-with-spring-security/
I found that with spring boot 2.0.2.RELEASE, configuring spring-boot-starter-data-jpa and com.h2database in the POM file is not just enough to have H2 console working. You must configure spring-boot-devtools as below.
Optionally you could follow the instruction from Aaron Zeckoski in this post
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>
Use jdbc:h2:mem:testdb as your path when logging into the H2 console.
Obviously if you have altered Spring Boot properties your datasource may be different, but it seems like you're struggling with how to find the default. That's all there is to it! You'll see your schema after logging in to H2.
I had made a very stupid mistake when I had this same problem. I had added H2 DB for running unit test cases and hence I had set the scope to test in pom.xml. While running the application using mvn spring:run I removed the scope and it works fine now.