[JAVA] Generated code contains value which is expressed as integer but is too large for integer.

Description

We use a swagger file which contains the following field definition:

          number:
            type: integer
            description: >-
              The unique identification of an action discount for an insurance
              policy.
            maximum: 1e+10
            minimum: 0
            exclusiveMaximum: true

The java file generated contains this code:

@Min(0) @Max(10000000000) 
  public Long getNumber() {
    return number;
  }

The java compiler complains about the value 10000000000 because it is too big to be expressed as an integer.

The code generation should generate 10000000000L instead.

Swagger-codegen version

2.3.1

Swagger declaration file content or url

See description.

Command line used for generation

Generated from Maven:

                    <execution>
                        <id>generate-model</id>
                        <phase>generate-test-sources</phase>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                        <configuration>
                            <inputSpec>src/main/resources/swagger/swagger.yaml</inputSpec>
                            <apiPackage>nl.xxx.gen.yyy.api</apiPackage>
                            <modelPackage>nl.xxx.gen.yyy.model</modelPackage>
                            <generateApis>false</generateApis>
                            <language>spring</language>
                            <configOptions>
                                <dateLibrary>java8</dateLibrary>
                                <interfaceOnly>true</interfaceOnly>
                            </configOptions>
                            <library>spring-mvc</library>
                        </configuration>
                    </execution>

Steps to reproduce

Use this field in swagger definition:

          number:
            type: integer
            description: >-
              The unique identification of an action discount for an insurance
              policy.
            maximum: 1e+10
            minimum: 0
            exclusiveMaximum: true

Generate the model using this maven configuration:

                    <execution>
                        <id>generate-model</id>
                        <phase>generate-sources</phase>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                        <configuration>
                            <inputSpec>src/main/resources/swagger/swagger.yaml</inputSpec>
                            <apiPackage>nl.xxx.gen.yyy.api</apiPackage>
                            <modelPackage>nl.xxx.gen.yyy.model</modelPackage>
                            <generateApis>false</generateApis>
                            <language>spring</language>
                            <configOptions>
                                <dateLibrary>java8</dateLibrary>
                                <interfaceOnly>true</interfaceOnly>
                            </configOptions>
                            <library>spring-mvc</library>
                        </configuration>
                    </execution>

Related issues/PRs

Suggest a fix/enhancement

When the underlying data type is Long, always generate the validation rules using the "L suffix" notation for java.

E.g: not 10000000000000 but 10000000000000L

Start by reproducing the Maven model generation with the Swagger declaration shown in the issue and inspect the generated Java model containing the @Max value. Trace the Java validation annotation template or generation entry point responsible for numeric bounds. Done means the generated Long bound uses the L suffix and the generated source compiles.