We have a Spring Boot based application. We deploy it using an executable jar, which is about 20 megabytes. When we launch this application, it immediately uses the memory of the “Virutual” 18Gigs. I understand that most of them are stored in secondary storage, such as a hard drive, but our system administrators ask why we need so much virtual memory.
The jar file is small. When I start, I use BoneCPDataSource, but I reduced the number of connections to 5. As soon as the application is running, it uses 18 g of virtual memory.
Can someone tell me why? Do I have to play with java memory settings on the command line to reduce this number? The team we use:
java -jar filename.jar
According to the request, here is additional information:
1) Here is the line from the 'top'
command : 24511 xyz 20 0 17.6g 531m 9.8m S 0.0 0.8 0: 16.57 java
2) No Neo4J. Here is my pom.xml
http://maven.apache.org/xsd/maven-4.0.0.xsd "> 4.0.0
<groupId>com.xyz.myapp</groupId>
<artifactId>myapp-rest-service</artifactId>
<version>0.1.0</version>
<properties>
<start-class>com.xyz.myapp.rest.Application</start-class>
</properties>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.0.1.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>com.jolbox</groupId>
<artifactId>bonecp</artifactId>
<version>0.8.0.RELEASE</version>
<exclusions>
<exclusion>
<groupId>com.jolbox</groupId>
<artifactId>com.jolbox.logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.0.3.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>4.0.3.RELEASE</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.0-rc1</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.0-rc1</version>
</dependency>
<dependency>
<groupId>oracle</groupId>
<artifactId>jdbc</artifactId>
<version>6.0</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-bundle</artifactId>
<version>1.18.1</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>spring-snapshots</id>
<url>http://repo.spring.io/libs-snapshot</url>
<snapshots><enabled>true</enabled></snapshots>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-snapshots</id>
<url>http://repo.spring.io/libs-snapshot</url>
<snapshots><enabled>true</enabled></snapshots>
</pluginRepository>
</pluginRepositories>
3) I create this application using the following command:
mvn clean package
and this is what it creates in the directory. / target:
-rwxr-xr-x 1 myuserid Domain Users 20259555 Jun 9 15:36 myapp-rest-service-0.1.0.jar
4) lsof for my application:
http://pastebin.com/V00BrD67
5) Conclusion from the mvn: tree dependency
http://pastebin.com/cFnR0NMX