Runtime error - Request header is too large

Basically add this to your applications.properties file

server.max-http-request-header-size=20000

20000 can be greater or smaller

Application.properties file

Typical settings

spring.application.name=vat_calculator_service
server.max-http-request-header-size=20000
# H2 Database configuration
spring.datasource.url=jdbc:h2:mem:testdb
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=sa
spring.datasource.password=password
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
spring.h2.console.enabled=true
spring.jpa.defer-datasource-initialization=true
spring.jpa.hibernate.ddl-auto=update

# Incase you are using MYSQL Database please comment/remove h2 database configuration above
# And uncomment below configuration
#spring.jpa.hibernate.ddl-auto=update
#spring.datasource.url=jdbc:mysql://localhost:3306/mydb
#spring.datasource.username=root
#spring.datasource.password=password

spring.jpa.show-sql = true

Using H2-DB

Spring Boot With H2 Database | Baeldung

maven build plugin

Use this plig to build your springboot application as a single jar with the mainclass path

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
				<executions>
					<execution>
						<goals>
							<goal>repackage</goal>
						</goals>
						<configuration>
							<classifier>spring-boot</classifier>
							<mainClass>
								com.celestial.vatcsl.VatCalculatorServiceApplication
							</mainClass>
						</configuration>
					</execution>
				</executions>
			</plugin>
		</plugins>
	</build>

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Runtime error - Request header is too large

Application.properties file

Typical settings

Using H2-DB

maven build plugin

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