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Update to Cloud SDK 5.35.0 breaks tests with connection pool size of 1 #1297

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Update to Cloud SDK 5.35.0 breaks tests with connection pool size of 1#1297
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bugSomething isn't working

Description

@mofterdinger
mofterdinger
opened on Oct 5, 2026

Describe the Bug

Hi, I'm from CAP Java and we are using the Cloud SDK for outgoing HTTP requsts in several scenarios. After upgrading the Cloud SDK from 5.33.0 to 5.35.0 one our test is failing. This test uses an HTTP connection pool of size 1, which doesn't seem to work. I assume it's because of this PR in Cloud SDK: #1292 that was merged into 5.35.0.
It looks like the Cloud SDK requires as minimum connection pool size of 2, right ? Is this a bug or done intentionally ?

Thanks,
Markus

Steps to Reproduce

Create an HTTP connection pool with size 1 and try to send an HTTP request.

Expected Behavior

Support connection pool size of 1.

Screenshots

No response

Used Versions

  • Java and Maven version via mvn --version:
Apache Maven 3.9.16 (2bdd9fddda4b155ebf8000e807eb73fd829a51d5)
Maven home: /opt/homebrew/Cellar/maven@3.9.16/3.9.16/libexec
Java version: 25.0.4.1, vendor: Homebrew, runtime: /opt/homebrew/Cellar/openjdk@25/25.0.4.1/libexec/openjdk.jdk/Contents/Home
Default locale: en_US, platform encoding: UTF-8
OS name: "mac os x", version: "27.0.1", arch: "aarch64", family: "mac"
  • SAP Cloud SDK version: 5.35.0
  • Spring Boot or CAP version: Spring-Boot 4.1.x and CAP Java 5.2.0-SNAPSHOT
Dependency tree via mvn dependency:tree 
[INFO] ---------------< com.sap.cds:cds-integration-cloud-sdk >----------------
[INFO] Building CDS Cloud SDK integration 5.2.0-SNAPSHOT
[INFO]   from pom.xml
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] 
[INFO] --- dependency:3.11.0:tree (default-cli) @ cds-integration-cloud-sdk ---
[INFO] com.sap.cds:cds-integration-cloud-sdk:jar:5.2.0-SNAPSHOT
[INFO] +- com.sap.cds:cds-services-api:jar:5.2.0-SNAPSHOT:compile
[INFO] |  +- com.sap.cds:cds4j-api:jar:5.2.0-m20260930-114808:compile
[INFO] |  +- org.slf4j:slf4j-api:jar:2.0.19:compile
[INFO] |  \- com.sap.cloud.environment.servicebinding.api:java-core-api:jar:0.31.0:compile
[INFO] +- com.sap.cds:cds-services-utils:jar:5.2.0-SNAPSHOT:compile
[INFO] |  +- com.sap.cds:cds-adapter-api:jar:5.2.0-SNAPSHOT:compile
[INFO] |  +- com.sap.cds:cds4j-core:jar:5.2.0-m20260930-114808:compile
[INFO] |  +- com.sap.cds:cds4j-runtime:jar:5.2.0-m20260930-114808:compile
[INFO] |  |  \- com.sap.cds:cds4j-jdbc-spi:jar:5.2.0-m20260930-114808:compile
[INFO] |  +- commons-io:commons-io:jar:2.22.0:compile
[INFO] |  +- io.opentelemetry:opentelemetry-api:jar:1.66.0:compile
[INFO] |  |  \- io.opentelemetry:opentelemetry-context:jar:1.66.0:compile
[INFO] |  |     \- io.opentelemetry:opentelemetry-common:jar:1.66.0:compile
[INFO] |  +- io.opentelemetry:opentelemetry-sdk:jar:1.66.0:compile
[INFO] |  |  +- io.opentelemetry:opentelemetry-sdk-common:jar:1.66.0:compile
[INFO] |  |  +- io.opentelemetry:opentelemetry-sdk-trace:jar:1.66.0:compile
[INFO] |  |  +- io.opentelemetry:opentelemetry-sdk-metrics:jar:1.66.0:compile
[INFO] |  |  \- io.opentelemetry:opentelemetry-sdk-logs:jar:1.66.0:compile
[INFO] |  +- com.google.guava:guava:jar:33.7.1-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:1.0.1:compile
[INFO] |  |  +- com.google.errorprone:error_prone_annotations:jar:2.50.0:compile
[INFO] |  |  \- com.google.j2objc:j2objc-annotations:jar:3.1:compile
[INFO] |  +- com.fasterxml.jackson.core:jackson-databind:jar:2.21.6:compile
[INFO] |  |  +- com.fasterxml.jackson.core:jackson-annotations:jar:2.21:compile
[INFO] |  |  \- com.fasterxml.jackson.core:jackson-core:jar:2.21.6:compile
[INFO] |  +- org.apache.commons:commons-lang3:jar:3.21.0:compile
[INFO] |  \- com.github.ben-manes.caffeine:caffeine:jar:3.3.0:compile
[INFO] +- com.sap.cds:cds-services-impl:jar:5.2.0-SNAPSHOT:runtime
[INFO] |  +- com.sap.cds:cds-services-messaging:jar:5.2.0-SNAPSHOT:runtime
[INFO] |  |  \- jakarta.jms:jakarta.jms-api:jar:3.1.0:runtime
[INFO] |  +- com.sap.cds:cds4j-cql:jar:5.2.0-m20260930-114808:runtime
[INFO] |  |  \- org.antlr:antlr4-runtime:jar:4.13.2:runtime
[INFO] |  +- com.sap.cloud.environment.servicebinding.api:java-access-api:jar:0.31.0:compile
[INFO] |  +- org.apache.commons:commons-csv:jar:1.14.1:runtime
[INFO] |  |  \- commons-codec:commons-codec:jar:1.22.1:compile
[INFO] |  \- com.cronutils:cron-utils:jar:9.2.1:runtime
[INFO] +- com.sap.cloud.sdk.cloudplatform:tenant:jar:5.35.0:compile
[INFO] |  +- com.sap.cloud.sdk.cloudplatform:cloudplatform-core:jar:5.35.0:compile
[INFO] |  +- io.vavr:vavr:jar:1.0.1:compile
[INFO] |  |  \- io.vavr:vavr-match:jar:1.0.0:compile
[INFO] |  \- com.auth0:java-jwt:jar:4.6.1:compile
[INFO] +- com.sap.cloud.sdk.cloudplatform:security:jar:5.35.0:compile
[INFO] +- com.sap.cloud.sdk.cloudplatform:connectivity-apache-httpclient4:jar:5.35.0:compile
[INFO] |  +- com.sap.cloud.sdk.cloudplatform:cloudplatform-connectivity:jar:5.35.0:compile
[INFO] |  |  +- com.mikesamuel:json-sanitizer:jar:1.2.3:compile
[INFO] |  |  +- org.bouncycastle:bcprov-jdk18on:jar:1.86:compile
[INFO] |  |  \- org.bouncycastle:bcpkix-jdk18on:jar:1.86:compile
[INFO] |  |     \- org.bouncycastle:bcutil-jdk18on:jar:1.86:compile
[INFO] |  +- com.sap.cloud.sdk.cloudplatform:caching:jar:5.35.0:compile
[INFO] |  +- org.slf4j:jcl-over-slf4j:jar:2.0.19:runtime
[INFO] |  +- org.apache.httpcomponents:httpcore:jar:4.4.16:compile
[INFO] |  \- org.apache.httpcomponents:httpclient:jar:4.5.14:compile
[INFO] +- com.sap.cloud.sdk.cloudplatform:connectivity-apache-httpclient5:jar:5.35.0:compile
[INFO] |  +- org.apache.httpcomponents.client5:httpclient5:jar:5.6.4:compile
[INFO] |  |  \- org.apache.httpcomponents.core5:httpcore5-h2:jar:5.4.3:compile
[INFO] |  \- org.apache.httpcomponents.core5:httpcore5:jar:5.4.4:compile
[INFO] +- com.sap.cloud.sdk.cloudplatform:connectivity-oauth:jar:5.35.0:compile
[INFO] |  +- com.sap.cloud.environment.servicebinding.api:java-consumption-api:jar:0.31.0:compile
[INFO] |  +- com.sap.cloud.security.xsuaa:token-client:jar:4.1.2:compile
[INFO] |  +- com.sap.cloud.security:java-api:jar:4.1.2:compile
[INFO] |  +- org.json:json:jar:20260814:compile
[INFO] |  \- com.sap.cloud.security:java-security:jar:4.1.2:runtime
[INFO] |     \- com.sap.cloud.security:env:jar:4.1.2:runtime
[INFO] |        +- com.sap.cloud.environment.servicebinding:java-sap-vcap-services:jar:0.31.0:runtime
[INFO] |        \- com.sap.cloud.environment.servicebinding:java-sap-service-operator:jar:0.31.0:runtime
[INFO] +- com.sap.cloud.sdk.cloudplatform:resilience:jar:5.35.0:compile
[INFO] |  +- com.sap.cloud.sdk.cloudplatform:resilience-api:jar:5.35.0:compile
[INFO] |  \- com.sap.cloud.sdk.cloudplatform:resilience4j:jar:5.35.0:compile
[INFO] |     +- io.github.resilience4j:resilience4j-core:jar:2.4.0:compile
[INFO] |     +- io.github.resilience4j:resilience4j-circuitbreaker:jar:2.4.0:compile
[INFO] |     +- io.github.resilience4j:resilience4j-bulkhead:jar:2.4.0:compile
[INFO] |     +- io.github.resilience4j:resilience4j-timelimiter:jar:2.4.0:compile
[INFO] |     +- io.github.resilience4j:resilience4j-retry:jar:2.4.0:compile
[INFO] |     +- io.github.resilience4j:resilience4j-ratelimiter:jar:2.4.0:compile
[INFO] |     \- javax.cache:cache-api:jar:1.1.1:compile
[INFO] +- org.junit.jupiter:junit-jupiter:jar:6.1.3:test
[INFO] |  +- org.junit.jupiter:junit-jupiter-api:jar:6.1.3:test
[INFO] |  |  +- org.opentest4j:opentest4j:jar:1.3.0:test
[INFO] |  |  +- org.junit.platform:junit-platform-commons:jar:6.1.3:test
[INFO] |  |  \- org.apiguardian:apiguardian-api:jar:1.1.2:test
[INFO] |  +- org.junit.jupiter:junit-jupiter-params:jar:6.1.3:test
[INFO] |  \- org.junit.jupiter:junit-jupiter-engine:jar:6.1.3:test
[INFO] |     \- org.junit.platform:junit-platform-engine:jar:6.1.3:test
[INFO] +- org.hamcrest:hamcrest:jar:3.0:test
[INFO] +- org.wiremock:wiremock-jetty12:jar:3.13.2:test
[INFO] |  +- org.wiremock:wiremock:jar:3.13.2:test
[INFO] |  |  +- com.fasterxml.jackson.datatype:jackson-datatype-jsr310:jar:2.21.6:test
[INFO] |  |  +- org.xmlunit:xmlunit-core:jar:2.11.0:test
[INFO] |  |  |  \- jakarta.xml.bind:jakarta.xml.bind-api:jar:2.3.3:test
[INFO] |  |  |     \- jakarta.activation:jakarta.activation-api:jar:1.2.2:test
[INFO] |  |  +- org.xmlunit:xmlunit-legacy:jar:2.11.0:test
[INFO] |  |  +- org.xmlunit:xmlunit-placeholders:jar:2.11.0:test
[INFO] |  |  +- net.javacrumbs.json-unit:json-unit-core:jar:2.40.1:test
[INFO] |  |  |  \- org.hamcrest:hamcrest-core:jar:2.2:test
[INFO] |  |  +- com.jayway.jsonpath:json-path:jar:2.10.0:test
[INFO] |  |  |  \- net.minidev:json-smart:jar:2.6.0:test
[INFO] |  |  |     \- net.minidev:accessors-smart:jar:2.6.0:test
[INFO] |  |  +- net.sf.jopt-simple:jopt-simple:jar:5.0.4:test
[INFO] |  |  +- com.github.jknack:handlebars:jar:4.3.1:test
[INFO] |  |  +- com.github.jknack:handlebars-helpers:jar:4.3.1:test
[INFO] |  |  +- commons-fileupload:commons-fileupload:jar:1.6.0:test
[INFO] |  |  \- com.networknt:json-schema-validator:jar:1.5.9:test
[INFO] |  |     +- com.ethlo.time:itu:jar:1.14.0:test
[INFO] |  |     \- com.fasterxml.jackson.dataformat:jackson-dataformat-yaml:jar:2.21.6:test
[INFO] |  |        \- org.yaml:snakeyaml:jar:2.7:test
[INFO] |  +- org.eclipse.jetty:jetty-server:jar:12.0.30:test
[INFO] |  |  +- org.eclipse.jetty:jetty-http:jar:12.0.30:test
[INFO] |  |  \- org.eclipse.jetty:jetty-io:jar:12.0.30:test
[INFO] |  +- org.eclipse.jetty:jetty-proxy:jar:12.0.30:test
[INFO] |  |  \- org.eclipse.jetty:jetty-client:jar:12.0.30:test
[INFO] |  +- org.eclipse.jetty:jetty-alpn-server:jar:12.0.30:test
[INFO] |  +- org.eclipse.jetty:jetty-alpn-java-server:jar:12.0.30:test
[INFO] |  +- org.eclipse.jetty:jetty-alpn-java-client:jar:12.0.30:test
[INFO] |  +- org.eclipse.jetty:jetty-alpn-client:jar:12.0.30:test
[INFO] |  +- org.eclipse.jetty.ee10:jetty-ee10-servlet:jar:12.0.30:test
[INFO] |  |  +- jakarta.servlet:jakarta.servlet-api:jar:6.0.0:provided
[INFO] |  |  +- org.eclipse.jetty:jetty-security:jar:12.0.30:test
[INFO] |  |  \- org.eclipse.jetty:jetty-session:jar:12.0.30:test
[INFO] |  +- org.eclipse.jetty.ee10:jetty-ee10-servlets:jar:12.0.30:test
[INFO] |  |  \- org.eclipse.jetty:jetty-util:jar:12.0.30:test
[INFO] |  +- org.eclipse.jetty.ee10:jetty-ee10-webapp:jar:12.0.30:test
[INFO] |  |  +- org.eclipse.jetty:jetty-ee:jar:12.0.30:test
[INFO] |  |  \- org.eclipse.jetty:jetty-xml:jar:12.0.30:test
[INFO] |  \- org.eclipse.jetty.http2:jetty-http2-server:jar:12.0.30:test
[INFO] |     \- org.eclipse.jetty.http2:jetty-http2-common:jar:12.0.30:test
[INFO] |        \- org.eclipse.jetty.http2:jetty-http2-hpack:jar:12.0.30:test
[INFO] +- org.mockito:mockito-core:jar:5.23.0:test
[INFO] |  +- net.bytebuddy:byte-buddy:jar:1.17.7:test
[INFO] |  +- net.bytebuddy:byte-buddy-agent:jar:1.17.7:test
[INFO] |  \- org.objenesis:objenesis:jar:3.3:test
[INFO] \- org.slf4j:slf4j-reload4j:jar:2.0.19:test
[INFO]    \- ch.qos.reload4j:reload4j:jar:1.2.22:test```
</details>

### Code Examples

```java
// Your code here

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Log File

Log file ...

Affected Development Phase

Getting Started

Impact

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Activity

  1. mofterdinger
    added
    bugSomething isn't working
    on Oct 5, 2026

  2. mofterdinger commented on Oct 5, 2026

    @mofterdinger
    mofterdinger
    on Oct 5, 2026
    Author

    Hi, this issue was already reported by a colleague for version 5.34.0 of the Cloud SDK: #1270 (comment)
    Looks like it's not solved with 5.35.0

  3. StefanHenke commented on Oct 7, 2026

    @StefanHenke
    StefanHenke
    on Oct 7, 2026

    The reported issue is caused by the fact that the CsrfTokenInterceptor has been introduced and applied to any created HttpClient. I think this applies to 5.34.0, but also to 5.35.0. Some pieces in regards to the adoption of HttpClient 5 in the OData Client has been reverted in 5.35.0, but the introduction of CsrfTokenInterceptor seems to be still there. This needs to be checked by the CloudSDK team.

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