How to accept self-signed certificates when generating OpenAPI clients? - ssl

Question

I have a rest service that is documented with OpenAPI 2.0. It is secured via a self-signed ssl-certificate, which cannot be replaced, because it is highly likely, the service will run on localhost in production.
I generate a client from the OpenAPi specification with the swagger-codegen-maven-plugin. The client seems to work, but it rejects the self-signed certificate.
The underlying http library is okhttp, which is able to accept self-signed certificates, but due to the circumstance, I need to be able to regenerate my client anytime, I cannot incorporate the necessary changes in the generated client.
How can I make okhttp accept my certificate?
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.playground</groupId>
<artifactId>api-client</artifactId>
<version>0.0.1-SNAPSHOT</version>
<properties>
<java.version>1.8</java.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<gson-fire.version>1.8.0</gson-fire.version>
<swagger-core.version>1.5.15</swagger-core.version>
<okhttp.version>2.7.5</okhttp.version>
<gson.version>2.8.1</gson.version>
<threetenbp.version>1.3.5</threetenbp.version>
<junit-version>4.12</junit-version>
<swagger-codegen-maven-plugin.version>2.3.1</swagger-codegen-maven-plugin.version>
</properties>
<dependencies>
<dependency>
<groupId>com.playground</groupId>
<artifactId>playground-api</artifactId>
<version>0.1.1-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<!-- Tag: Swagger SDK Dependencies -->
<dependency>
<groupId>io.swagger</groupId>
<artifactId>swagger-annotations</artifactId>
<version>${swagger-core.version}</version>
</dependency>
<dependency>
<groupId>com.squareup.okhttp</groupId>
<artifactId>okhttp</artifactId>
<version>${okhttp.version}</version>
</dependency>
<dependency>
<groupId>com.squareup.okhttp</groupId>
<artifactId>logging-interceptor</artifactId>
<version>${okhttp.version}</version>
</dependency>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>${gson.version}</version>
</dependency>
<dependency>
<groupId>io.gsonfire</groupId>
<artifactId>gson-fire</artifactId>
<version>${gson-fire.version}</version>
</dependency>
<dependency>
<groupId>org.threeten</groupId>
<artifactId>threetenbp</artifactId>
<version>${threetenbp.version}</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit-version}</version>
<scope>test</scope>
</dependency>
<!-- End: Swagger SDK Dependencies -->
</dependencies>
<build>
<plugins>
<plugin>
<groupId>io.swagger</groupId>
<artifactId>swagger-codegen-maven-plugin</artifactId>
<version>${swagger-codegen-maven-plugin.version}</version>
<executions>
<execution>
<goals>
<goal>generate</goal>
</goals>
<configuration>
<inputSpec>${project.basedir}/src/main/resources/spec.json</inputSpec>
<language>java</language>
<generateApiTests>false</generateApiTests>
<configOptions>
<sourceFolder>src/gen/java/main</sourceFolder>
</configOptions>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>