The template string is not valid.

[engineer-mk]

return openaiChatClient.prompt()
.user(message)
.advisors(advisorSpec -> {
advisorSpec.param(AbstractChatMemoryAdvisor.CHAT_MEMORY_CONVERSATION_ID_KEY, "123456")
.param(AbstractChatMemoryAdvisor.CHAT_MEMORY_RETRIEVE_SIZE_KEY, "100");
})
.toolContext(Map.of("userId", "123456"))
.stream()
.content();

while message contains '{''}' for example： public Boolean isAuthentication(@nullable String token) { if (StringUtils.isBlank(token)) { return false; } return getUserId(token) != null; }

java.lang.IllegalArgumentException: The template string is not valid.
at org.springframework.ai.chat.prompt.PromptTemplate.(PromptTemplate.java:86) ~[spring-ai-core-1.0.0-M6.jar:1.0.0-M6]

[johnsonr]

This occurs because ChatClient ultimately calls a PromptTemplate constructor which attempts to use ST.

This makes it difficult to use ChatClient with another, more capable, templating mechanism like Jinjava or Mustache. It's particularly problematic when emitting code examples, which is a common requirement. See #1849. . I've been forced several times to use ChatModel rather than ChatClient to avoid this problem, which is disappointing as it doesn't provide elegant entity conversion.

It should be possible to pass a literal String that won't be evaluated as a template if the user chooses.

This simple change might allow users to use their own template mechanism, potentially deferring the need to support other template mechanisms.

[markpollack]

This has now been fixed, the PR is #2920 and searching for TemplateRenderer in the docs will show you how to use it. You can provide your own TemplateRender impls.