ERROR:java.lang.NullPointerException: Cannot invoke "com.fasterxml.jackson.databind.JsonNode.getNodeType()" because the return value of "com.fasterxml.jackson.databind.JsonNode.get(String)" is null

[abinggo]

I used with langchain4j with java, however, occured the ERROR @Bean public McpClient firecrawlMcpClient() { List<String> command = List.of( "firecrawl-mcp" // 或者用完整路径，避免依赖 npx );

    Map<String, String> environment = Map.of(
            "FIRECRAWL_API_KEY", firecrawlApiKey
    );

    return McpClientFactory.createMcpClient(command, environment);
}

java.lang.NullPointerException: Cannot invoke "com.fasterxml.jackson.databind.JsonNode.getNodeType()" because the return value of "com.fasterxml.jackson.databind.JsonNode.get(String)" is null at dev.langchain4j.mcp.client.ToolSpecificationHelper.jsonNodeToJsonSchemaElement(ToolSpecificationHelper.java:48) ~[langchain4j-mcp-1.0.0-beta3.jar:na] at dev.langchain4j.mcp.client.ToolSpecificationHelper.jsonNodeToJsonSchemaElement(ToolSpecificationHelper.java:68) ~[langchain4j-mcp-1.0.0-beta3.jar:na] at dev.langchain4j.mcp.client.ToolSpecificationHelper.toolSpecificationListFromMcpResponse(ToolSpecificationHelper.java:37) ~[langchain4j-mcp-1.0.0-beta3.jar:na] at dev.langchain4j.mcp.client.DefaultMcpClient.obtainToolList(DefaultMcpClient.java:266) ~[langchain4j-mcp-1.0.0-beta3.jar:na] at dev.langchain4j.mcp.client.DefaultMcpClient.listTools(DefaultMcpClient.java:139) ~[langchain4j-mcp-1.0.0-beta3.jar:na] at dev.langchain4j.mcp.McpToolProvider.provideTools(McpToolProvider.java:34) ~[langchain4j-mcp-1.0.0-beta3.jar:na] at