fix: non null assertions, hibernate bytecode enhancer

Author: cyyynthia

backend/data/build.gradle

@@ -267,3 +267,8 @@ ktlint {
         exclude("**/PluralData.kt")
     }
 }
+
+hibernate {
+    // Block is required for Bytecode Enhancement to happen
+    enhancement {}
+}

ee/backend/app/build.gradle

@@ -98,7 +98,7 @@ dependencies {
     /**
      * Excel file generation
      */
-    implementation 'org.apache.poi:poi-ooxml:5.3.0'
+    implementation 'org.apache.poi:poi-ooxml:5.4.0'
     implementation 'org.apache.commons:commons-collections4:4.4'
 
     /**
@@ -107,8 +107,16 @@ dependencies {
     implementation('com.github.jknack:handlebars:4.4.0')
 }
 
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(21)
+    }
+}
+
 kotlin {
-    jvmToolchain(21)
+    compilerOptions {
+        freeCompilerArgs.addAll("-Xjsr305=strict")
+    }
 }
 
 dependencyManagement {

ee/backend/tests/build.gradle

@@ -63,8 +63,16 @@ dependencies {
     testImplementation libs.jacksonModuleKotlin
 }
 
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(21)
+    }
+}
+
 kotlin {
-    jvmToolchain(21)
+    compilerOptions {
+        freeCompilerArgs.addAll("-Xjsr305=strict")
+    }
 }
 
 dependencyManagement {

ee/backend/tests/src/test/kotlin/io/tolgee/ee/WebhookAutomationTest.kt

@@ -113,7 +113,7 @@ class WebhookAutomationTest : ProjectAuthControllerTest("/v2/projects/") {
     val signature = httpEntity.headers["Tolgee-Signature"]
     signature.assert.isNotNull
     verifyWebhookSignatureHeader(
-      httpEntity.body,
+      httpEntity.body!!,
       signature!!.single(),
       secret,
       300000,

ee/backend/tests/src/test/kotlin/io/tolgee/ee/api/v2/controllers/EeSubscriptionUsageControllerTest.kt

@@ -96,7 +96,7 @@ class EeSubscriptionUsageControllerTest : AuthorizedControllerTest() {
             node("isPayAsYouGo").isEqualTo(true)
           }
 
-        val body = this.captor.allValues.single().body
+        val body = this.captor.allValues.single().body!!
         assertThatJson(body) {
           node("licenseKey").isEqualTo("mock")
         }

ee/backend/tests/src/test/kotlin/io/tolgee/ee/selfHostedLimitsAndReporting/CreditLimitTest.kt

@@ -27,6 +27,7 @@ import org.springframework.boot.test.context.SpringBootTest
 import org.springframework.boot.test.mock.mockito.MockBean
 import org.springframework.boot.test.mock.mockito.SpyBean
 import org.springframework.boot.web.client.RestTemplateBuilder
+import org.springframework.http.HttpHeaders
 import org.springframework.http.HttpMethod.POST
 import org.springframework.http.HttpStatus
 import org.springframework.web.client.HttpClientErrorException
@@ -116,7 +117,7 @@ class CreditLimitTest : ProjectAuthControllerTest("/v2/projects/") {
       HttpClientErrorException.create(
         HttpStatus.BAD_REQUEST,
         "Mocked response",
-        null,
+        HttpHeaders(),
         """{"code": "$errorCode"}""".toByteArray(),
         null,
       )