Failed to obtain R2DBC, this publisher does not support multiple subscribers

[xuandungdoan]

I try to run r2dbc application with spring-boot-starter-data-r2dbc and oracle-r2dbc but it gives me an exception " org.springframework.dao.DataAccessResourceFailureException: Failed to obtain R2DBC Connection; nested exception is java.lang.IllegalStateException: This publisher does not support multiple subscribers". Here is my properties file: spring.r2dbc.url=r2dbc:oracle:thin://localhost:1521:orcl spring.r2dbc.username=user spring.r2dbc.password=password and dependenices part of gradle file: dependencies { ktlint 'com.pinterest:ktlint:0.41.0' implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlinVersion") implementation("org.jetbrains.kotlin:kotlin-reflect:$kotlinVersion") implementation('com.fasterxml.jackson.module:jackson-module-kotlin') implementation('org.codehaus.janino:janino') implementation('org.springframework.cloud:spring-cloud-starter-stream-kafka') implementation('org.springframework.cloud:spring-cloud-stream') implementation('org.springframework.boot:spring-boot-configuration-processor') implementation('org.apache.httpcomponents:httpclient:4.5.8') implementation('org.springframework.retry:spring-retry') implementation("org.springframework.boot:spring-boot-starter-webflux") implementation('org.springframework.boot:spring-boot-starter-data-r2dbc') implementation('com.oracle.database.r2dbc:oracle-r2dbc') implementation('com.oracle.database.jdbc:ojdbc11:21.1.0.0') } Am I missing any configuration or is this a known limitation?

[Michael-A-McMahon]

Hi @xuandungdoan, this is a known issue with v0.1.0 of Oracle R2DBC. The ConnectionFactory.create() Publisher did not support multiple subscribers. This has been fixed since v0.2.0.

However, I don't think Spring currently supports the newer versions of Oracle R2DBC. The newer versions are implementing milestone releases of the 0.9 R2DBC SPI, and I believe that Spring only supports the 0.8 SPI at the moment.

A general availability (GA) release of the 0.9 R2DBC SPI is planned for November. After the GA release, I think it's probable that Spring would add support for 0.9.

I'll leave this issue open so that other Spring programmers can find it easily.

[Michael-A-McMahon]

Closing this issue as it has been resolved in newer releases. If anyone is still facing this: Please update to a newer Oracle R2DBC release.