GsonVdmEntityAdapter causes intermittent IllegalAccessException on VdmComplex subclasses under concurrent serialization

オープン

#1,226 2026年7月16日に作成コメント 1 件リアクション 0 件担当者 0 名 GitHub で見る

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評価

難易度: 3/5
見積もり時間: 1〜2日
初心者へのやさしさ: 55/100

issue の種類: バグ
明瞭さ: おおむね明確
活発さ: 静か
技術スタック: java
領域: api

調査の方向性

GsonVdmEntityAdapterを開き、309行目付近のgetEntityAsJsonObjectを調査して、報告書で説明されている共有entityProperties Fieldへのアクセスとアクセシビリティの復元に注目してください。提供されているUsageRecordAggregationRequestを使用した並行シリアライズテストを再現し、並行実行によってIllegalAccessExceptionのログが生成されないことを確認してください。

索引モデルが issue の本文から書いたものです。

説明

bug

Describe the Bug

From time to time, we could observe some error logs like "Could not serialize property 'ratingPeriodStart'. Returning null instead." from logger "com.sap.cloud.sdk.datamodel.odatav4.adapter.GsonVdmEntityAdapter".

After some analysis, here is the issue:
GsonVdmEntityAdapter stores java.lang.reflect.Field objects in a shared entityProperties map. Under concurrent serialization, the setAccessible(false) restore call on a shared Field object races with another
thread's Field.get(), causing an intermittent IllegalAccessException.

Steps to Reproduce

Reproduction

Using UsageRecordAggregationRequest (a generated VdmComplex subclass) with 100 concurrent threads each performing 100,000 serializations. Reproduces ~60% of test runs.

  // Mirrors ActionRequestBuilder's static final fields exactly
  private static final Gson GSON = new GsonBuilder().serializeNulls().create();
  private static final GsonVdmAdapterFactory GSON_VDM_ADAPTER_FACTORY = new GsonVdmAdapterFactory();

  @SuppressWarnings("unchecked")
  private static String serializeRequests(List<UsageRecordAggregationRequest> requests) {
      var typeToken = TypeToken.get((Class<List<UsageRecordAggregationRequest>>) requests.getClass());
      var adapter = GSON_VDM_ADAPTER_FACTORY.create(GSON, typeToken);
      return adapter != null
              ? adapter.toJsonTree(requests).toString()
              : GSON.toJsonTree(requests).toString();
  }

  @Test
  void concurrentSerialization_shouldNotThrowIllegalAccessException() throws Exception {
      // attach ListAppender to GsonVdmEntityAdapter logger to catch swallowed exceptions
      // ... (full test in attachment)

      assertThat(illegalAccessLogs).isZero();
  }

Observed error log:

ERROR GsonVdmEntityAdapter -- Could not serialize property 'ratingPeriodStart'. Returning null instead.
java.lang.IllegalAccessException: class com.sap.cloud.sdk.datamodel.odatav4.adapter.GsonVdmEntityAdapter
cannot access a member of class ...UsageRecordAggregationRequest with modifiers "private"
at jdk.internal.reflect.Reflection.newIllegalAccessException
at java.lang.reflect.AccessibleObject.checkAccess
at java.lang.reflect.Field.checkAccess
at java.lang.reflect.Field.get
at GsonVdmEntityAdapter.getEntityAsJsonObject(GsonVdmEntityAdapter.java:309)

Expected Behavior

No such errors occur.

Screenshots

No response

Used Versions

Java and Maven version via mvn --version:

Apache Maven 3.9.16 (2bdd9fddda4b155ebf8000e807eb73fd829a51d5)
Maven home: /opt/homebrew/Cellar/maven/3.9.16/libexec
Java version: 21.0.11, vendor: SAP SE, runtime: /Library/Java/JavaVirtualMachines/sapmachine-21.jdk/Contents/Home
Default locale: en_CN, platform encoding: UTF-8
OS name: "mac os x", version: "26.5.1", arch: "aarch64", family: "mac"

SAP Cloud SDK version: 5.31.0
Spring Boot or CAP version: 3.5.16

Dependency tree via mvn dependency:tree

[INFO] com.sap.ngom:usage-record-client:jar:3.0.0
[INFO] +- org.springframework.boot:spring-boot-starter-web:jar:3.5.16:provided
[INFO] |  +- org.springframework.boot:spring-boot-starter:jar:3.5.16:provided
[INFO] |  |  +- org.springframework.boot:spring-boot:jar:3.5.16:provided
[INFO] |  |  +- org.springframework.boot:spring-boot-autoconfigure:jar:3.5.16:provided
[INFO] |  |  +- org.springframework.boot:spring-boot-starter-logging:jar:3.5.16:provided
[INFO] |  |  |  +- ch.qos.logback:logback-classic:jar:1.5.38:provided
[INFO] |  |  |  |  \- ch.qos.logback:logback-core:jar:1.5.38:provided
[INFO] |  |  |  +- org.apache.logging.log4j:log4j-to-slf4j:jar:2.25.4:provided
[INFO] |  |  |  |  \- org.apache.logging.log4j:log4j-api:jar:2.25.4:provided
[INFO] |  |  |  \- org.slf4j:jul-to-slf4j:jar:2.0.18:provided
[INFO] |  |  +- jakarta.annotation:jakarta.annotation-api:jar:2.1.1:provided
[INFO] |  |  \- org.yaml:snakeyaml:jar:2.4:provided
[INFO] |  +- org.springframework.boot:spring-boot-starter-json:jar:3.5.16:provided
[INFO] |  |  +- com.fasterxml.jackson.datatype:jackson-datatype-jdk8:jar:2.21.5:provided
[INFO] |  |  +- com.fasterxml.jackson.datatype:jackson-datatype-jsr310:jar:2.21.5:provided
[INFO] |  |  \- com.fasterxml.jackson.module:jackson-module-parameter-names:jar:2.21.5:provided
[INFO] |  +- org.springframework.boot:spring-boot-starter-tomcat:jar:3.5.16:provided
[INFO] |  |  +- org.apache.tomcat.embed:tomcat-embed-core:jar:10.1.57:provided
[INFO] |  |  \- org.apache.tomcat.embed:tomcat-embed-websocket:jar:10.1.57:provided
[INFO] |  +- org.springframework:spring-web:jar:6.2.19:provided
[INFO] |  |  +- org.springframework:spring-beans:jar:6.2.19:provided
[INFO] |  |  \- io.micrometer:micrometer-observation:jar:1.15.12:provided
[INFO] |  |     \- io.micrometer:micrometer-commons:jar:1.15.12:provided
[INFO] |  \- org.springframework:spring-webmvc:jar:6.2.19:provided
[INFO] |     +- org.springframework:spring-aop:jar:6.2.19:provided
[INFO] |     +- org.springframework:spring-context:jar:6.2.19:provided
[INFO] |     \- org.springframework:spring-expression:jar:6.2.19:provided
[INFO] +- org.springframework.boot:spring-boot-starter-validation:jar:3.5.16:provided
[INFO] |  +- org.apache.tomcat.embed:tomcat-embed-el:jar:10.1.57:provided
[INFO] |  \- org.hibernate.validator:hibernate-validator:jar:8.0.3.Final:provided
[INFO] |     +- jakarta.validation:jakarta.validation-api:jar:3.0.2:provided
[INFO] |     +- org.jboss.logging:jboss-logging:jar:3.6.3.Final:provided
[INFO] |     \- com.fasterxml:classmate:jar:1.7.3:provided
[INFO] +- com.sap.cloud.sdk.datamodel:odata-v4-core:jar:5.31.0:compile
[INFO] |  +- com.sap.cloud.sdk.datamodel:odata-client:jar:5.31.0:compile
[INFO] |  +- com.sap.cloud.sdk.cloudplatform:cloudplatform-core:jar:5.31.0:compile
[INFO] |  +- com.sap.cloud.sdk.cloudplatform:cloudplatform-connectivity:jar:5.31.0:compile
[INFO] |  |  +- com.sap.cloud.sdk.cloudplatform:resilience-api:jar:5.31.0:compile
[INFO] |  |  +- com.sap.cloud.sdk.cloudplatform:security:jar:5.31.0:compile
[INFO] |  |  +- com.sap.cloud.environment.servicebinding.api:java-core-api:jar:0.31.0:compile
[INFO] |  |  +- com.sap.cloud.environment.servicebinding.api:java-access-api:jar:0.31.0:compile
[INFO] |  |  +- com.mikesamuel:json-sanitizer:jar:1.2.3:compile
[INFO] |  |  +- com.auth0:java-jwt:jar:4.5.2:compile
[INFO] |  |  +- org.bouncycastle:bcprov-jdk18on:jar:1.84:compile
[INFO] |  |  \- org.bouncycastle:bcpkix-jdk18on:jar:1.84:compile
[INFO] |  |     \- org.bouncycastle:bcutil-jdk18on:jar:1.84:compile
[INFO] |  +- com.sap.cloud.sdk.cloudplatform:connectivity-apache-httpclient4:jar:5.31.0:compile
[INFO] |  |  +- com.sap.cloud.sdk.cloudplatform:caching:jar:5.31.0:compile
[INFO] |  |  +- com.sap.cloud.sdk.cloudplatform:tenant:jar:5.31.0:compile
[INFO] |  |  \- com.github.ben-manes.caffeine:caffeine:jar:3.2.4:compile
[INFO] |  +- com.sap.cloud.sdk.datamodel:fluent-result:jar:5.31.0:compile
[INFO] |  +- org.slf4j:slf4j-api:jar:2.0.18:compile
[INFO] |  +- org.slf4j:jcl-over-slf4j:jar:2.0.18:runtime
[INFO] |  +- com.google.guava:guava:jar:33.6.0-jre:compile
[INFO] |  |  +- com.google.guava:failureaccess:jar:1.0.3:compile
[INFO] |  |  +- com.google.guava:listenablefuture:jar:9999.0-empty-to-avoid-conflict-with-guava:compile
[INFO] |  |  +- org.jspecify:jspecify:jar:1.0.0:compile
[INFO] |  |  +- com.google.errorprone:error_prone_annotations:jar:2.47.0:compile
[INFO] |  |  \- com.google.j2objc:j2objc-annotations:jar:3.1:compile
[INFO] |  +- com.google.code.gson:gson:jar:2.13.2:compile
[INFO] |  +- com.fasterxml.jackson.core:jackson-annotations:jar:2.21:compile
[INFO] |  +- com.fasterxml.jackson.core:jackson-core:jar:2.21.5:compile
[INFO] |  +- com.fasterxml.jackson.core:jackson-databind:jar:2.21.5:compile
[INFO] |  +- org.apache.httpcomponents:httpclient:jar:4.5.14:compile
[INFO] |  |  \- commons-codec:commons-codec:jar:1.18.0:compile
[INFO] |  +- io.vavr:vavr:jar:1.0.1:compile
[INFO] |  |  \- io.vavr:vavr-match:jar:1.0.0:compile
[INFO] |  +- org.apache.httpcomponents:httpcore:jar:4.4.16:compile
[INFO] |  \- com.google.code.findbugs:jsr305:jar:3.0.2:compile
[INFO] +- org.projectlombok:lombok:jar:1.18.46:provided
[INFO] +- org.apache.commons:commons-lang3:jar:3.18.0:compile
[INFO] +- com.sap.dwc:util-headers:jar:2.17.0:provided
[INFO] |  +- com.sap.dwc:util-model:jar:2.17.0:provided
[INFO] |  +- org.apache.httpcomponents.client5:httpclient5:jar:5.5.2:provided
[INFO] |  |  \- org.apache.httpcomponents.core5:httpcore5-h2:jar:5.3.6:provided
[INFO] |  +- org.apache.httpcomponents.core5:httpcore5:jar:5.3.6:provided
[INFO] |  \- com.sap.dwc.commons:commons-util:jar:2.23.0:provided
[INFO] +- com.sap.dwc:util-routing:jar:2.17.0:provided
[INFO] +- com.sap.ngom:bc-metric-client:jar:2.0.0-20260623084922_a29592b:compile
[INFO] |  \- com.jayway.jsonpath:json-path:jar:2.9.0:compile
[INFO] \- org.springframework.boot:spring-boot-starter-test:jar:3.5.16:test
[INFO]    +- org.springframework.boot:spring-boot-test:jar:3.5.16:test
[INFO]    +- org.springframework.boot:spring-boot-test-autoconfigure:jar:3.5.16:test
[INFO]    +- jakarta.xml.bind:jakarta.xml.bind-api:jar:4.0.5:test
[INFO]    |  \- jakarta.activation:jakarta.activation-api:jar:2.1.4:test
[INFO]    +- net.minidev:json-smart:jar:2.5.2:runtime
[INFO]    |  \- net.minidev:accessors-smart:jar:2.5.2:runtime
[INFO]    |     \- org.ow2.asm:asm:jar:9.7.1:runtime
[INFO]    +- org.assertj:assertj-core:jar:3.27.7:test
[INFO]    |  \- net.bytebuddy:byte-buddy:jar:1.17.8:test
[INFO]    +- org.awaitility:awaitility:jar:4.2.2:test
[INFO]    +- org.hamcrest:hamcrest:jar:3.0:test
[INFO]    +- org.junit.jupiter:junit-jupiter:jar:5.12.2:test
[INFO]    |  +- org.junit.jupiter:junit-jupiter-api:jar:5.12.2:test
[INFO]    |  |  +- org.opentest4j:opentest4j:jar:1.3.0:test
[INFO]    |  |  +- org.junit.platform:junit-platform-commons:jar:1.12.2:test
[INFO]    |  |  \- org.apiguardian:apiguardian-api:jar:1.1.2:test
[INFO]    |  +- org.junit.jupiter:junit-jupiter-params:jar:5.12.2:test
[INFO]    |  \- org.junit.jupiter:junit-jupiter-engine:jar:5.12.2:test
[INFO]    |     \- org.junit.platform:junit-platform-engine:jar:1.12.2:test
[INFO]    +- org.mockito:mockito-core:jar:5.17.0:test
[INFO]    |  +- net.bytebuddy:byte-buddy-agent:jar:1.17.8:test
[INFO]    |  \- org.objenesis:objenesis:jar:3.3:test
[INFO]    +- org.mockito:mockito-junit-jupiter:jar:5.17.0:test
[INFO]    +- org.skyscreamer:jsonassert:jar:1.5.3:test
[INFO]    |  \- com.vaadin.external.google:android-json:jar:0.0.20131108.vaadin1:test
[INFO]    +- org.springframework:spring-core:jar:6.2.19:provided
[INFO]    |  \- org.springframework:spring-jcl:jar:6.2.19:provided
[INFO]    +- org.springframework:spring-test:jar:6.2.19:test
[INFO]    \- org.xmlunit:xmlunit-core:jar:2.10.4:test

Code Examples

https://github.tools.sap/sb-bnb/usage-record-management-client/pull/660

Stack Trace

java.lang.IllegalAccessException: class com.sap.cloud.sdk.datamodel.odatav4.adapter.GsonVdmEntityAdapter cannot access a member of class com.sap.ngom.urm.client.vdm.namespaces.usagerecords2s.UsageRecordAggregationRequest with modifiers "private"
	at java.base/jdk.internal.reflect.Reflection.newIllegalAccessException(Unknown Source)
	at java.base/java.lang.reflect.AccessibleObject.checkAccess(Unknown Source)
	at java.base/java.lang.reflect.Field.checkAccess(Unknown Source)
	at java.base/java.lang.reflect.Field.get(Unknown Source)
	at com.sap.cloud.sdk.datamodel.odatav4.adapter.GsonVdmEntityAdapter.getEntityAsJsonObject(GsonVdmEntityAdapter.java:309)
	at com.sap.cloud.sdk.datamodel.odatav4.adapter.GsonVdmEntityAdapter.write(GsonVdmEntityAdapter.java:277)
	at com.sap.cloud.sdk.datamodel.odatav4.adapter.GsonVdmEntityAdapter.write(GsonVdmEntityAdapter.java:41)
	at com.google.gson.TypeAdapter$NullSafeTypeAdapter.write(TypeAdapter.java:304)
	at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:73)
	at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:100)
	at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:64)
	at com.google.gson.Gson.toJson(Gson.java:943)
	at com.google.gson.Gson.toJsonTree(Gson.java:801)
	at com.google.gson.Gson.toJsonTree(Gson.java:778)
	at com.sap.cloud.sdk.datamodel.odatav4.core.ActionRequestBuilder.serialize(ActionRequestBuilder.java:116)
	at com.sap.cloud.sdk.datamodel.odatav4.core.ActionRequestBuilder.lambda$serializeParameters$0(ActionRequestBuilder.java:146)
	at java.base/java.util.HashMap.forEach(Unknown Source)
	at com.sap.cloud.sdk.datamodel.odatav4.core.ActionRequestBuilder.serializeParameters(ActionRequestBuilder.java:146)
	at com.sap.cloud.sdk.datamodel.odatav4.core.ActionRequestBuilder.toRequest(ActionRequestBuilder.java:138)
	at com.sap.cloud.sdk.datamodel.odatav4.core.CollectionValueActionRequestBuilder.execute(CollectionValueActionRequestBuilder.java:101)
	at com.sap.cloud.sdk.datamodel.odatav4.core.CollectionValueActionRequestBuilder.execute(CollectionValueActionRequestBuilder.java:25)
	at com.sap.ngom.urm.client.service.impl.UsageRecordClientImpl.runUsageRecordAggregation(UsageRecordClientImpl.java:76)

Log File

Log file

...

Affected Development Phase

Production

Impact

Impaired

Timeline

No response

主要言語: Java
スター: 41
フォーク: 33
平均マージ: 18時間 34分
マージ済み PR（30日）: 19

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