diff --git a/core/pom.xml b/core/pom.xml
index 97eb2ac..512d231 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -38,9 +38,15 @@
       <version>2.1.3</version>
     </dependency>
     <dependency>
-      <groupId>io.smallrye.common</groupId>
-      <artifactId>smallrye-common-constraint</artifactId>
-      <version>2.5.0</version>
+      <groupId>org.jspecify</groupId>
+      <artifactId>jspecify</artifactId>
+      <version>1.0.0</version>
+    </dependency>
+    <dependency>
+      <groupId>io.github.eisop</groupId>
+      <artifactId>checker-qual</artifactId>
+      <version>3.42.0-eisop4</version>
+      <scope>provided</scope>
     </dependency>
 
     <!-- Include Parsson for backwards-compatibility. -->
@@ -83,14 +89,55 @@
       <plugin>
         <artifactId>maven-compiler-plugin</artifactId>
         <configuration>
+          <fork>true</fork>
           <annotationProcessorPaths>
             <path>
               <groupId>org.openjdk.jmh</groupId>
               <artifactId>jmh-generator-annprocess</artifactId>
               <version>1.37</version>
             </path>
+            <path>
+              <groupId>io.github.eisop</groupId>
+              <artifactId>checker</artifactId>
+              <version>3.42.0-eisop4</version>
+            </path>
           </annotationProcessorPaths>
+          <compilerArgs>
+            <arg>-Xmaxerrs</arg>
+            <arg>10000</arg>
+            <arg>-Xmaxwarns</arg>
+            <arg>10000</arg>
+          </compilerArgs>
         </configuration>
+        <executions>
+          <execution>
+            <id>default-compile</id>
+            <configuration>
+              <annotationProcessors>
+                <annotationProcessor>org.checkerframework.checker.nullness.NullnessChecker</annotationProcessor>
+              </annotationProcessors>
+              <compilerArgs combine.children="append">
+                <arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED</arg>
+                <arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED</arg>
+                <arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED</arg>
+                <arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.main=ALL-UNNAMED</arg>
+                <arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.model=ALL-UNNAMED</arg>
+                <arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED</arg>
+                <arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED</arg>
+                <arg>-J--add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED</arg>
+                <arg>-J--add-opens=jdk.compiler/com.sun.tools.javac.comp=ALL-UNNAMED</arg>
+              </compilerArgs>
+            </configuration>
+          </execution>
+          <execution>
+            <id>default-testCompile</id>
+            <configuration>
+              <annotationProcessors>
+                <annotationProcessor>org.openjdk.jmh.generators.BenchmarkProcessor</annotationProcessor>
+              </annotationProcessors>
+            </configuration>
+          </execution>
+        </executions>
       </plugin>
 
       <plugin>